NEW YORK, March 18 (UPI) -- New York police said they are trying to figure out why officers have visited an elderly couple's home more than 50 times seeking suspects they had never met.

Walter Martin, 83, and his wife, Rose, 82, said police have knocked on their door up to 75 times since 2002 and each time said they were seeking a suspect or key witness in crimes including robbery, murder and rape, the New York Daily News reported Thursday.

"Our identity theft squad is investigating the matter," police spokesman Ed Mullen said.

The Martins said they had never heard of any of the suspects until police came to their door.

"I'm really worried," Rose Martin said. "How could so many people get my address and how could cops be coming from so many different precincts?"