San Diego Police Department Chief Shelley Zimmerman said there is no credible threat to San Diego after the terror attacks in London.
"As always @SanDiegoPD ask you to stay vigilant," Zimmerman tweeted after the attack. "Prayers to London."
British police arrested a dozen people Sunday over a vehicle and knife attack in London that left seven people dead.
The assault unfolded over a few terrifying minutes Saturday, starting when a van veered off the road and barreled into pedestrians on busy London Bridge. Three men fled the van with large knives and attacked people at bars and restaurants in nearby Borough Market, police and witnesses said.
London's Metropolitan Police said armed officers fatally shot the attackers within eight minutes. Eight officers fired a total of 50 rounds at the attackers, police said. The force said the men were wearing what looked like suicide vests that turned out to be fake.
Emergency officials said 48 people, including two police officers, were treated at hospitals across London. Thirty-six victims were still being treated Sunday afternoon, 21 of who were critically injured, authorities said. French and Spanish citizens were among the wounded.
The death toll of seven didn't include the three attackers.
For details on the London attacks, click here.