Germany has closed down the glass and steel dome and rooftop terrace of the famous Reichstag parliament building to visitors over concerns of a possible terror attack.

Islamic extremists who trained at terrorist camps in Afghanistan and Pakistan may be plotting attacks in Germany, the head of the country’s federal crime office said in comments released today.

German authorities were today searching for 10 suspected supporters of an Islamic group linked to al-Qaida who are believed to have assisted the three militants arrested earlier this week in their foiled bomb plot.

Three Islamic militants from an al-Qaida-influenced group nursing a “profound hatred of US citizens” were arrested on suspicion of plotting imminent, massive bomb attacks targeting Americans in Germany, prosecutors said today.

Three suspected Islamic terrorists were arrested for plotting “massive” bomb attacks on Frankfurt’s international airport and the Ramstein US Air Base, German authorities said today.