Libya’s capital is under siege for the fourth night in a row, as a fresh round of Western aistrikes hit Tripoli again on Tuesday. “We’ve been hearing big noises. We’ve heard some explosions in the last 10 minutes,” said an Al Jazeera reporter in the city. Witnesses said the strikes are zeroing in near the Gaddafi residence (his location is still unknown) and the capital’s air defenses are retaliating with fire. A ground battle continues to rage as well: Pro-Gaddafi troops reportedly killed dozens in the rebel stronghold of Benghazi today, defying the airstrikes.