US warplanes have carried out air strikes targeting fighters aligned with the Islamic State of Iraq and the Levant (ISIL) in Libya, killing dozens of people, possibly including a senior leader of the armed group. US military sources told AFP news agency the operation hit an ISIL training camp early on Friday and was aimed at killing Noureddine Chouchane, a Tunisian accused of helping to organise two attacks on tourists last year. Peter Cook, Pentagon press secretary, said in a press conference that the operation was carried out in the North African country to prevent ISIL from carrying out "external attacks against US interests.""We made it clear that we need to confront to ISIL wherever it rears its head," Cook said in Washington DC. "We feel confident that this was a successful strike."