Rotterdam, Safar 17, 1438, Nov 17, 2016, SPA -- An anonymous tip about a possible security threat at Rotterdam airport led to a major police operation on Thursday, according to authorities. Police began checking all cars and buses arriving at the airport from around midday, police in Rotterdam said, according to dpa. "We had a telephone call that gave us more than enough reason to take these precautions," said spokesman Gijs van Nimwegen. He confirmed on Thursday evening that the security measures were still in place. Despite the possibility of a security threat, no delays had been caused to flights, the airport said. -- SPA 22:48 LOCAL TIME 19:48 GMT www.spa.gov.sa/w271801