Tripoli, Libya (CNN) -- A fighter jet was shot down and burst into flames Saturday in the area of Benghazi, Libya. Explosions could also be heard in the city, which has been a stronghold for rebels opposing Libyan leader Moammar Gadhafi. It was not immediately clear who the fighter jet belonged to. The development is significant, in part, because Benghazi has been considered the center of the opposition forces. The opposition has been pushed back from other cities that it used to have control of, and rebels have vowed to defend Benghazi to the death. A day earlier, the Libyan government said it was abiding by a cease-fire, but witnesses have said violence from pro-Gadhafi forces have continued. Libya late Friday called for international observers to come and verify the cease-fire.
@highlight
Clinton will meet Saturday with allies
@highlight
Libya says it is not engaging advancing rebel forces
@highlight
Libya invites international observers to visit country
@highlight
Libyan troops must pull back from several cities, Obama says
Government forces "did not cause the deaths of any civilians," instead inflicting casualties on armed rebel militias, and will not assault @placeholder, Kaim said.