New York City ? Fears of a security breach caused a flight from Los Angeles to London to be diverted to New York early Thursday, but after searching the plane and re-screening its 230 passengers, officials said they found nothing suspicious.

A flight attendant on the American Airlines plane became concerned that a passenger might not have gone through proper security screening before boarding the Heathrow Airport-bound flight at Los Angeles International Airport, said airline spokeswoman Sonja Whitemon.

The flight attendant had seen the male passenger ride to the terminal on an employee bus and bypass security, as employees are able to do, Whitemon said. After talking to the passenger, flight crew members decided they needed to divert the plane, she said.

Authorities questioned the man at New York’s Kennedy International Airport and determined he was not a threat, according to Christopher White of the Transportation Security Administration.