U.S. Open Employee Accused Of Making Bomb Threat September 4, 2008 A teenage employee at the U.S. Open Tennis Championships in Flushing Meadows, Queens, has been charged with making a series of phone calls to the venue Wednesday – while at work – claiming that a bomb had been planted at the Arthur Ashe Stadium there. The threats turned out to be a hoax. Mahmet M. Kadayifci, 19, of 34-24 77th St. in the Elmhurst section of Queens. Kadayifci, who is a contracted employee with the U.S. Tennis Association (USTA) assigned to the fire watch area at the U.S. Open,...