An envelope delivered to the Toledo Police Department in Ohio has reportedly exploded, FOX Toledo reported.
At least two officers were hurt in the blast, which happened just after 2 p.m. on the fourth floor. Both were decontaminated and were being treated at the hospital.
The envelope was sent to the station's detective bureau, according to FOX Toledo. It had a Washington Township return address.
The fourth floor of the station was locked down after the incident. Fire, FBI and bomb officials were investigating.