OTTAWA — Prime Minister Justin Trudeau says Wednesday's apparent terrorist incident outside the British Parliament is a "cowardly attack" on democracy around the world.

And he says Canada stands ready to help Britain in any way it can after the attack, which left at least four dead in London.

London police say the dead include the attacker and a police officer, and some 20 more have been wounded in the incident, which occurred on the grounds of the Parliament Buildings and the nearby Westminster Bridge.

Parliament remains in a lock-down while the police continue to search the area to ensure there are no other attackers.

In Canada's House of Commons, Trudeau called the attack on Britain's seat of democracy "a cowardly and reprehensible act that we condemn in the strongest terms.