NEW : Mortar rounds land in Misrata clinic , causing casualties . The airstrikes hit several rebel vehicles , reports say . A government spokesman says the rebels are not serious about a cease - fire . An opposition leader calls for the use of snipers , artillery and tanks .
NEW : Mortar rounds land in Misrata clinic , causing casualties . Coalition airstrikes hit several rebel vehicles , reports say . A government spokesman says the rebels are not serious about a cease-fire . An opposition leader calls for the removal of snipers , mercenaries and militias .