Police detained dozens of people yesterday in sweeps through the Russian city of Volgograd after two deadly attacks in less than 24 hours raised security fears ahead of the Winter Olympics.

A blast that tore through an electric bus in the southern Russian city of Volgograd during Monday’s morning rush hour, killing 14, was probably carried out by suicide bombers from the same organisation behind a railway explosion a day earlier, officials said.

Fifteen people died and scores were wounded when a female suicide bomber struck at a railway station in southern Russia.

A female suicide bomber killed at least 14 people and wounded scores more at a railway station in southern Russia.

Russia has apologised to two foreign journalists who were repeatedly questioned and detained by police during a trip to report on the 2014 Winter Olympics preparations in the Black Sea resort of Sochi.

Two hard-line Muslims suspected of planning to attack a chemical weapons plant have been arrested in Russia.

Russia has installed an all- encompassing surveillance system at the site of next year’s Winter Olympic Games in Sochi that will allow security services to listen in on athletes and visitors, security analysts claimed.

If Tamerlan Tsarnaev was already plotting the Boston Marathon bombings when he stayed in this bustling city at the heart of Islamist insurgency last year, neighbours say he hid it well.

A Russian rebel group is denying any link to the deadly Boston marathon bombings.

In May of 2011, Dzhokhar A Tsarnaev, then a senior at a top high school, was awarded a $2,500 scholarship from the city of Cambridge, Massachusetts, to pursue higher education.

The two suspects in the Boston Marathon bombing were from the Russian region near Chechnya, sources have told the Associated Press, as a massive police manhunt continues for the surviving suspect.

Kidnapped aid workers could be saved by a new hi-tech bracelet which uses Facebook and Twitter to alert millions of people to a hostage crisis.

Russia has launched an investigation into the death of a 27-year-old man in an inflatable “zorb” ball that tumbled down a mountainside in a horrific accident that was caught on video, a spokesman said.

A suicide bomber blew himself up at the funeral for a policeman in southern Russia, killing at least seven other policemen and badly wounding 12 others.

Russian agents have foiled terror attack plans on the Black Sea resort of Sochi, host of the 2014 Winter Games, and seized a large amount of weapons and ammunition, authorities say.

At least 13 people have been killed and scores more injured in two powerful explosions in Russia’s restive North Caucasus.

RUSSIAN authorities have foiled a plot by militants who were building fertiliser bombs in a suburban apartment and planning to attack a bullet train between Moscow and St Petersburg, a newspaper reported.

A suicide bomber has killed a police officer in Russia today.

PRIME Minister Vladimir Putin vowed revenge yesterday for a suicide bombing that killed at least 35 people at Russia’s busiest airport and underscored the Kremlin’s failure to stem a rising tide of attacks.

ISLAMIC insurgents including a suicide bomber stormed Chechnya’s parliament, leaving six people dead and 17 injured in one of the most brazen attacks on the provincial capital in months, officials said.

Shooting has erupted in the parliament of Russia’s volatile Chechnya region, Russian news agencies reported today.

Floods in southern Russia have killed eight people and forced the evacuation of at least 160 others, authorities said today.

A SUICIDE car bomber hit the central market of a major city in Russia’s North Caucasus yesterday, killing at least 17 and wounding more than 130 people in one of the worst attacks in the volatile region in years, officials said.

At least 15 people are now dead after a suicide car bomber targeted a city marker in Russia’s north Caucasus today.

At least five people were killed and 20 injured today when a car exploded near the central market of a major city in Russia’s restive North Caucasus region, officials said.

Police in southern Russia said security forces today killed the man suspected of organising the Moscow underground bombings in March that killed 40 people and wounded more than 100.

Six policemen and nine militants have been killed in separate shootings in Russia’s violence-plagued North Caucasus, police said today.

A Moscow judge who jailed murdering neo-Nazis was shot dead today amid a surge of violence against activists and officials opposed to Russian nationalists.

Russian investigators say two police officers were killed today by a suicide bomber in a restive North Caucasus province near Chechnya.

RUSSIA has identified a 17-year-old widow of a Caucasus militant as one of the Moscow suicide bombers, while the country remained on high alert after the attacks.

One of the Moscow subway suicide bombers was the 17-year-old widow of a slain Islamist rebel from the North Caucasus, a leading Russian newspaper reported today.

PRESIDENT Dmitry Medvedev made a surprise visit yesterday to the violence-wracked southern province of Dagestan, telling police and security forces to use tougher, “more cruel” measures to fight the “scum” responsible for terrorist attacks.

Russian president Dmitry Medvedev made a surprise visit today to the violence-wracked southern province of Dagestan, telling police and security forces to use tougher, “more cruel” measures to fight the “scum” responsible for terrorist attacks.

TWO suicide bombers targeted authorities in southern Russia yesterday, killing 12 people, including nine police officers. Prime Minister Vladimir Putin said the blasts may have been organised by the same militants who attacked the Moscow subway.

A Chechen militant leader claimed responsibility today for twin suicide bombings on Moscow’s subway which killed 39 people and injured scores of others.

Two suspected suicide bombings in the southern Russian province of Dagestan have killed at least 12 people today, including nine police officers, officials said.

VLADIMIR PUTIN vowed yesterday to “drag out of the sewer” the masterminds of the twin suicide bombing of the Moscow subway system that killed 39 people and left scores wounded.

Russians today nervously returned to the subway stations where two suicide bombers killed 39 people, as the country began a day of mourning.

Flags flew at half-mast on government buildings and at the Kremlin as a day of national mourning for the victims of the Moscow tube blasts began.

Two women suicide bombers killed at least 38 people and wounded dozens more in rush-hour attacks on Moscow’s subway today.

Russian Prime Minister Vladimir Putin is vowing to "destroy those responsible" for the Moscow metro suicide attacks.

The Department of Foreign Affairs is contacting Irish citizens in Moscow, warning them of the danger of further attacks, in the wake of two suicide bombings in the Russian capital.

At least 34 people were killed and more than 25 injured when two female suicide bombers blew themselves up on subway trains during the morning rush-hour in Moscow, Russian officials said.

A suicide bomber blew up an explosives-packed car at a police station in Russia’s troubled North Caucasus today, killing at least six officers and wounding 16, police said.