Four Baltimore County Police officers and two EMS providers were injured by an explosion at a nail spa in Windsor Mill, Maryland, on Monday night, according to authorities.
A man sustained life-threatening injuries around the same time, fire officials said.
The explosion occurred in the 1700 block of Rolling Road at the Libra Nails & Spa, according to authorities. It damaged several other businesses, fire officials said.
Baltimore County fire officials said the man may be a previous employee of the business. He was known to the business and its employees, according to authorities.
He is considered to be a suspect in the fire investigation, according to Baltimore County Police Department spokesman John Connors. Charges are pending, Connors said. Hazardous materials may have been involved in the fire, county fire officials said.