A bomb has exploded outside the a police station in the Libya's eastern city of Benghazi, Reuters news agency reports.
Police officials told Reuters Friday's blast damaged the building and shattered the windows of a school opposite, without inflicting any injuries.
Around the same time, about 4am, 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.