Attackers set fire to Belgium’s national forensic crime laboratory early Monday morning, causing severe damage and potentially destroying DNA and other evidence considered crucial to cases involving terrorism, officials said.

No one was wounded in the attack, which occurred around 2 a.m. and destroyed part of the lab in the Neder-Over-Heembeek section of Brussels. Five people were arrested nearby but were released after questioning; the police are looking for the attackers.

“The possibility of a terrorist attack has not been confirmed,” Ine Van Wymersch, a spokeswoman for the Brussels prosecutor’s office, said at a news conference. “It goes without saying that several individuals would benefit if elements from their legal cases were destroyed. The investigation is ongoing, and all possible scenarios are being considered.”

Read More- New York Times