NEW : five rebels killed along frontline in NATO , hospital officials say . Human Rights Watch reports landmines in al-Brega . Following a United Nations mandate to protect civilians , NATO began bombing military targets in March . The drone that went down was a Libya Fire Scout , Dafniya spokesman says . U.S. senators introduce a resolution for limited U.S. involvement .
NEW : five rebels killed along frontline in NATO , hospital officials say . Human Rights Watch reports landmines in al-Brega . The drone that went down was a Libya Fire Scout , Dafniya spokesman says . U.S. senators introduce a resolution for limited U.S. involvement .