A bomb exploded outside a police station in the eastern Libyan city of Benghazi in the early hours of Friday, May 10, damaging the building and shattering the windows of a school opposite but causing no injuries, a police official said, according to Reuters.

Around the same time, about 4 a.m., a second police station was hit by a smaller explosive device that may have been a grenade, a witness said. No injuries were reported there either.

Police stations have been struck with explosives at least four times in the past month in Benghazi, the second largest city in Libya.

"Someone threw a bag of explosive material in front of the gate of the police station in the city centre, causing a big explosion and serious damage," a police officer said, describing the first incident.