Compound for pro - Gadhafi rebels was targeted . It is one of the heaviest air attacks on Libya so far . France to use attack helicopters , official says ; reports say it also plans to . The EU 's foreign policy chief expressed support to Libyan rebel government .
Compound for pro-Gadhafi volunteers was targeted . It is one of the heaviest NATO attacks on Tripoli so far . France to use attack helicopters , official says ; reports say UK also plans to . The EU 's foreign policy chief pledges support to Libyan rebel government .