London - Photos showed UK Police arresting a man in his thirties following an incident on London Bridge that took place on Saturday night. What appears to be multiple incidents have hit London late Saturday night. Police are treating as possible terrorist attacks, saying it is a ‘serious incident'. Armed police are at the scene on London Bridge. At 10:08 London time, police were sent to London Bridge after reports of a van that had swayed and veered, at high speed, plowing into pedestrians on the bridge. The London Bridge area is a touristic spot, with many people out at clubs and bars on Saturday nights. A second incident took place at Borough Market, not far from London Bridge. Witnesses say a man with a ‘huge knife' attacked people at the market. Witnesses scrambled under tables hiding from the man with the knife. The scene has been described as too chaotic to know if there were more than one attacker, or if any attackers have escaped.