A truck bomb exploded in the libyan city of Zliten near a police base, killing at least 60 policemen and wounding 200 on Thursday, officials said.
No one claimed responsibility for the bombing, but a local ISIS affiliate has been trying to gain a foothold in Zliten from its central stronghold of Sirte.
Rescue crews have only managed to extract 60 bodies out of the wreckage, a hospital spokesman, Moamar Kaddi, said.
libyan officials said they believed there might be dozens more dead. The base, where 400 police recruits were training, was used by the border police, a Zliten security official said.
Border police foiled numerous human smuggling attempts off the coast of Zliten last year. The official spoke on condition of anonymity because he was not authorised to speak to the media.
Smugglers are known in libya for responding with violence to any effort to disrupt their operations. In recent years, thousands of migrants seeking a better life in Europe sailed from libya on overcrowded boats. Hundreds have drowned.