Emergency workers recover bodies after an air strike killed nearly 40 at Tajoura detention centre. — AFP Photo

TRIPOLI – Nearly 40 migrants were killed in an air strike on Tuesday night on their detention centre in a Tripoli suburb blamed on Libyan strongman Khalifa Haftar, who has been trying for three months to seize the capital.

At least 70 were also wounded in the raid on Tajoura, an emergency services spokesman said.

"This is a preliminary assessment and the toll could rise," said spokesman Osama Ali.

He said 120 migrants were detained in the hangar which was directly hit by the strike.

Bodies were strewn on the floor of the hangar, mixed with the belongings and blood-soaked clothes of migrants, an AFP photographer said.

Rescuers were searching for survivors under the rubble, while dozens of ambulances rushed to the scene. 

In a statement, the internationally recognised national unity government (GNA) based in Tripoli denounced the attack as a "heinous crime" and blamed it on the "war criminal Khalifar Haftar".

Haftar, who controls much of eastern and southern Libya, in early April launched an offensive to take the capital.

The GNA accused pro-Haftar forces of having carried out a "premeditated" and "precise" attack on the migrant centre.

No one has so far claimed responsibility but pro-Haftar media reported Tuesday night a "series of air raids" in Tripoli and Tajoura.

The suburb of Tajoura, which has several military sites belonging to pro-GNA armed groups, is regularly targeted in air raids by Khalifa's forces. – AFP