(CNN) An airstrike that hit a migrant detention center near the Libyan capital early Wednesday has left at least 40 people dead and another 200 injured, a health official in the country's UN-recognized government told CNN.

"I expect the death toll to go up given that there are critically injured people being treated in hospital," Malek Merset, a spokesman for the Ministry of Health, said.

Satellite images taken of the detention center in Tajoura, a coastal town east of Tripoli, showed extensive damage to several buildings in the complex. Photos taken on the ground captured piles of rubble left where structures had been, while emergency crews worked to remove both the wounded and the dead.

Libya's Government of National Accord (GNA) condemned the "horrific crime," blaming renegade Gen. Khalifa Haftar, leader of the Libyan National Army (LNA), whose forces have been waging an assault on the capital for the last two months.

The LNA has denied responsibility for the attack, instead accusing Tripoli-based "militias" -- who are largely allied to the GNA -- of orchestrating a "conspiracy" to "tarnish" their reputation.

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