BELGRADE, Yugoslavia (AP) _ NATO launched a fourth day of attacks on Yugoslavia today, as more reports of heavy fighting and Serb atrocities in Kosovo emerged.

NATO was carrying its offensive closer to the Yugoslav capital of Belgrade. State-run media showed pictures of explosions and fires in Belgrade suburbs after Friday's third night of strikes and claimed civilians were killed and injured.

Today, reporters in Belgrade heard air raid sirens and a heavy impact. Shortly thereafter, a senior NATO official, who spoke on condition of anonymity from Washington, confirmed a new assault using Tomahawk cruise missiles.