United Nations, April 18 -- Heavy shelling which hit a densely-populated neighbourhood of Libya's capital, Tripoli, was condemned "in the strongest terms" by the head of the UN Mission there, after "scores" of civilians were reportedly killed and injured.

"Horrible night of random shelling of residential areas", tweeted UN Special Representative Ghassan Salame on Wednesday, after the Abu Salim district was hit. "For the sake of 3 million civilians living in Greater Tripoli, these attacks should stop. NOW!"

Khalifa Haftar, leader of the self-styled Libyan National Army (LNA), which controls much of eastern and southern Libya, has waged a two-week military campaign to take Tripoli from fighters loyal to the UN-recognized Government.

Acco...