Police and security in and around Canary Wharf has been stepped up in the wake of today's knife attack at the Houses of Parliament.

A Metropolitan Police spokesman has told The Wall Street Journal they were called at around 14:40 GMT to respond to a firearms incident at Westminster Bridge. The leader of the House of Commons, David Lidington, said a police officer had been stabbed and an alleged assailant shot by police. People were also injured after being hit by a car on the bridge, WSJ reports.