For the fourth time in just a week, a man who appears to be wearing explosives on his chest has robbed a Westchester business.Police say they believe the same suspect has struck two hotels, two restaurants, and now the Royal Regency Hotel in Yonkers in the last 7 days. Yonkers police say on Friday night around 7:45 p.m. the suspect walked into the Regency on Tuckahoe road. They say the suspect approached the front desk, demanding money and threatening that he was wearing an explosive device. This is the same description of a robber who has committed several robberies in the last week here in Westchester County.The other similar robberies took place at two separate Subway Restaurants in Hartsdale and Greenburgh and a Comfort Inn in Hawthorne. The Yonkers police say no one was hurt in any of the incidents. Yonkers detectives are continuing their investigation.Related Information: