Police make new arrest after Westminster terror attack

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

A 30-year-old man was arrested in the central city of Birmingham on suspicion of preparation of terrorist acts, London's Metropolitan Police said in a statement.

A dozen people have been arrested since 52-year-old Briton Khalid Masood launched an assault on parliament on Wednesday, killing four people and leaving 50 injured before he was shot by police.

Nine people have been released without charge, while a 58-year-old man remains in custody and a 32-year-old woman has been released on bail.

(This article has not been edited by DNA's editorial team and is auto-generated from an agency feed.)