A teacher at the Florida school where 17 people were shot dead has been arrested after authorities said he left a loaded gun in a public toilet, where a drunk homeless man picked it up and fired it.

Update 5.15pm: A gunman has died after a shooting at a high school in Maryland which left two people injured, a sheriff said.

The couple who provided a home to the Florida school shooting suspect before the Valentine's Day massacre has given evidence before a grand jury considering formal charges in the case.

The National Rifle Association is facing a corporate backlash as companies take a closer look at their ties to the gun industry following the latest school massacre.

US president Donald Trump has defied many of his supporters in gun lobbying group the National Rifle Association (NRA) by saying assault rifles should be kept out of the hands of anyone under 21.

Florida governor Rick Scott has called on FBI director Christopher Wray to resign after learning that the bureau failed to investigate a tip-off that the Florida school suspect could be planning an attack.

An American football coach who also worked as a security guard is among the dead in a school shooting that claimed 17 lives in Parkland, Florida.

Donald Trump has been labelled a "shit" on Twitter by a user who is believed to be a student at the Florida school where 17 students were shot dead.

A student opened fire at a private school in the northern Mexican city of Monterrey today, hitting a teacher and two other students in the head before killing himself.

Grieving families gathered today to bury 12 children gunned down in the halls of their Rio de Janeiro school, an unheard-of act of school violence which left stunned Brazilians struggling for answers.

One student was shot dead in a high-school hallway in Tacoma, Washington, USA, as classes were starting this morning, and police arrested another student found wandering in a neighbourhood a few miles away, officials said.

A student in Tacoma, Washington, USA, was shot dead in a high-school hallway as classes were starting this morning, and police were searching for the gunman, officials said.

The gunman who took six girls hostage in a high school classroom in Bailey, Colorado, killing one, had sexually assaulted at least some of them, the sheriff said today.

The gunman who took six girls hostage in a high school classroom in Bailey, Colorado, killing one of his captives and himself, began the takeover by ordering students to line up at the blackboard.

The high school in the tiny Colorado mountain town of Bailey was closed today.

A gunman took six girls hostage at the high school in the Colorado mountain town of Bailey, using them as human shields for hours before he shot and fatally wounded a girl and then killed himself as a SWAT team moved in, authorities said.

A middle-aged gunman walked into the high school in the US mountain town of Bailey, Colorado, yesterday, shot and critically wounded a student and then killed himself after police commando team members entered the building, authorities said.

Gun dealers have been questioned in a bid to trace the owner of a rifle used in the accidental shooting of a schoolboy in the North, it was revealed today.

A school in the North where a five-year-old boy was shot and injured in the playground was reopened today.

A 16-year-old boy walked into his school in southern Germany today and shot his female teacher in the leg before killing himself, police said.

Germany wants to give regulators the power to ban violent computer games following the shooting rampage at an Erfurt school last month.

Germans paused for a moment of silence today to honour the victims of last week’s school shooting that left 17 dead, while most classes in the stricken city of Erfurt were cancelled to give students a chance to express their grief and fears.

The parents of a teenage gunman who killed 16 people and himself at his former school did not know he had been expelled, German police have said.

A teacher in the Germany school massacre prevented further massacre by confronting the teenage gunman and locking him in a classroom.

An expelled student who went on a shooting rampage at his former school, had frequent run-ins with teachers and his parents.

A sign with the word "Help" scrawled on it was pasted to a window as the student in the Erfurt massacre went on the rampage with two guns.

An expelled pupil went on a gun rampage in a German school today - killing 17 people including at least two children, before he too died, police said.

Two gunmen, believed to be schoolboys, opened fire wildly inside a German school today, killing 18 people, including two teachers and a policeman.

A close-knit American community is in mourning after a student killed his dean, a lecturer and another student.

A gunman killed three people and wounded three others during a shooting spree today at the Appalachian School of Law, officials said.

Reports are coming in that six people have been shot in a school shooting in Virginia, US.

There has been a shooting at Martin Luther Secondary School in New York city today on the anniversary of the civil rights leader's death.

An 18-year-old student accused of shooting five people at his high school made a reference to the 1999 massacre at Columbine High in Colorado during class earlier this year and simulated guns with his hands, a classmate said.

A US school is in shock after a pupil shot three children, two teachers and sustained serious injuries himself in a gun battle.

An 18-year-old student has opened fire at his Californian high school, wounding three classmates and two teachers.

A boy has told how he persuaded an armed teenage girl to drop the gun she had used to shoot a classmate in the second US school shooting of the week.

A 14-year-old US schoolgirl is believed to have shot her classmate after a long-standing dispute.

A 13-year-old girl is recovering from gunshot wounds after the second US school shooting in the past three days.