NEW : Witness says 150 prisoners were killed by retreating Gadhafi troops . NEW : Lockerbie bomber found comatose and dying , his family says . Read more about al-Megrahi 's condition . NEW : Libyan rebels say they have captured a key military commander in the city of Misrata. Rebels have given Gadhafi forces in Sirte until Monday to disarm , rebel official says .
NEW : Witness says 150 prisoners were killed by retreating Gadhafi troops . NEW : Lockerbie bomber found comatose and dying , his family says . NEW : Libyan rebels say they have captured a key military commander in the city of Misrata. Rebels have given Gadhafi forces in Sirte until Monday to disarm , rebel official says .