Las Vegas Metropolitan Police Department K-9 officers search the Jewish Community Center of Southern Nevada after an employee received a suspicious phone call on Feb. 27. The Federal Communications Commission will offer temporary emergency waivers to Jewish Community Centers so they can obtain numbers for blocked callers in the wake of numerous bombs threats against the institutions nationwide, The Post has learned. “It’s a nationwide preemptive waiver for all JCCs and their carriers which lets them and law enforcement agencies get numbers even when the caller tries to block his or her number – no application necessary,” a US official said.