The man, identified only as Yamen A., 19, was held at dawn by special forces in the northeastern town of Schwerin, the federal prosecutor's office said in a statement.

British detectives have arrested a 17-year-old youth in connection with a bomb attack on an underground train in London last week that injured 30 people, bringing the total number of arrests to six, police said on Thursday.

Finland observed a minute of silence on Sunday for the victims of a stabbing attack that left two people dead in what is being investigated as the country's first-ever terror attack.

Police are now investigating a stabbing spree in Finland that left two people dead as a terrorist attack, police said Saturday, identifying the suspect as an 18-year-old Moroccan citizen.

Kenya has seized six men suspected of planning an attack sponsored by the al Shabaab militant group from neighbouring Somalia, the head of Kenyan police said late on Sunday.

Swedish police have arrested a man they suspect drove a beer delivery truck which rammed into a crowd in central Stockholm on Friday, killing four people and wounding 15 in what they described as a terror crime.

A Romanian woman who fell into the River Thames during last month's terror attack outside the British parliament has died in hospital, police said on Friday, bringing the toll to five.

Prince William, his wife Kate and his brother Prince Harry spoke with survivors and the families of those killed in the terror attack outside the British parliament at a memorial service on Wednesday.

British police investigating the terror attack on parliament made a new arrest on Sunday as authorities try to piece together the assailant's motive.

British police said on Friday they had made further "significant" arrests over the Islamist-inspired terror attack on parliament, as they released the first picture of the homegrown killer who left four people dead.

Britain's parliament went into lockdown on Wednesday as a police officer was stabbed and the alleged assailant shot, reportedly after ploughing down pedestrians on one of London's busiest bridges.

A 29-year-old Egyptian man has been confirmed as the suspect in the terror attack on soldiers guarding the Louvre Museum in Paris, a source close to the case told DPA on Tuesday.