Investing.com - The pound fell to the days lows on Tuesday following a reported shooting outside the British parliament and reports that at least a dozen people were injured in an incident on Westminster Bridge.
GBP/USD touched lows of 1.2424 and was at 1.2443 by 15.04 GMT, off 0.26% for the day.
The Houses of Parliament are on lockdown after gunshots were reportedly fired.
Witnesses inside parliament described seeing a man with a knife and journalist Quentin Letts described seeing a "parliamentary security men shoot a man who had attacked a policeman".
An air ambulance arrived to the scene.
Meanwhile, the London Metropolitan Police said officers were called following reports of an incident at Westminster Bridge, near parliament, in which at least a dozen people were injured. They may have been hit by a car.
Sterling was also lower against the euro, with EUR/GBP rising 0.25% to 0.8684 from around 0.8699 earlier.