Witnesses describe a vehicle "crashing into a crowd" of people on Westminster Bridge, leaving injured pedestrians behind, some "heavily bleeding" and with "catastrophic" injuries.

A vehicle then is said to have smashed into a fence outside Parliament palace, reportedly hitting other pedestrians or bicyclists.

An attacker, who entered Parliament's Palace Yard, stabbed a police officer, and was shot and apprehended. The officer is reported to have died, bringing the total killed in the attack to 4 thus far.

Prime Minister Theresa May was safely escorted from Parliament, as it went into lockdown and remains so at last report.

Police are not yet sure whether the three scenes of attack are related as the details in this terror "incident" are still emerging and being confirmed. (Map via Sky News)

President Trump was briefed on the attack and security has reportedly been heightened in NYC.

Media has noted that this is the one-year anniversary of the terror attack in Brussels, although it is not yet known whether that was motivation for this attack or not.

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