'Multiple casualties' reported in London stabbing and vehicle attacks

The BBC is reporting that a van struck 15 to 20 pedestrians on London Bridge, the historic bridge spanning the Thames River in London.

Armed police are on the scene.

More information on this story as it develops.

UPDATE (6:05 p.m. Eastern): Witnesses are reporting multiple bodies scattered on the pavement. Reports include bursts of gunfire and victims suffering from stab wounds.

UPDATE (6:35 p.m. Eastern): Witness reports that heavy gunfire preceded the incident.

UPDATE (6:43 p.m. Eastern): The Guardian is publishing reports of a second, possibly related incident at London's Borough Market.

The Guardianalso published an image of what is believed to be the vehicle used to run down pedestrians.

UPDATE (6:53 p.m.): Police are evacuating bars, hotels and other businesses in the area of the attacks.

Reuters reports that police are looking for three armed suspects:

UPDATE (7:09 p.m.): Police are reporting on a third incident in London's Vauxhall area.

UPDATE (8:00 p.m.): London police have officially declared the attack a terrorist incident.

However, the Vauxhall incident is no longer believed to be related to the London Bridge and Borough Market attacks.

President Donald Trump took to Twitter to complain that courts have overturned his anti-Musim travel ban.

Watch live coverage of the incident, embedded below: