麻豆约拍

Terrorist attacks can be prevented with the public's help, says the country's former top counter terrorism police officer.

Sir Mark Rowley tells Today that stopping terrorism is a collective responsibility and the police needs the support of communities to curb the risk.

A 29-year-old British citizen, originally from Sudan, is being held on suspicion of terrorism after the Westminster car crash on Tuesday.

(Image: Road near Parliament, credit: AFP)