"The Afghan plane reported shot down on Monday was apparently intercepted near Parachinar, where Pakistan says six of Kabul's planes carried out a bombing raid Feb. 27 that left at least 50 people dead.

A Pakistani Defense Ministry spokesman said the plane had fallen north of Parachinar and that patrols had been sent to search for the wreckage. He said witnesses saw no sign that the plane's crew had bailed out.

Officials did not identify the downed plane's type, but said it appeared to have been on a reconnaissance mission because it was flying alone."

"The official Soviet news agency Tass today said an Afghan plane shot down by Pakistan on Monday bore military markings but was unarmed and was carrying civilians on an internal flight."

"Pakistani fighters shot down an Afghan warplane that crossed into Pakistan today, the Defense Ministry said, and Afghan guerrillas said they had downed a second plane.

In a statement issued by the official Pakistani press agency, the Defense Ministry said debris was seen falling into the mountains north of Miranshah in the North Waziristan tribal agency.

The Afghan fighter intruded by six miles and was shot down by Pakistani fighters, the ministry said.

Afghan insurgents said the plane was apparently one of 16 that had been bombing guerrilla positions just across the border in Afghanistan.

Earlier, an official of the Hezb-i-Islami rebel group said guerrillas had shot down two of the planes. Later he said that the guerrillas could claim only one definite ''kill.'' The second plane could be the one downed by the Pakistani fighters, he said."

"Afghanistan said it shot down the American-made F-16 after two F-16's crossed the border at Khost district in Paktia Province in the border area southwest of Peshawar. It said the F-16's were at first warned and then fired upon by Afghan jets. Pakistan Reports Loss of Jet

Pakistan acknowledged that one of its jets had been downed but dismissed the Afghan version, saying that its planes had never violated Afghan airspace and were attacked in Pakistani territory.

The Pakistani authorities said the incident occurred Wednesday when six Afghan aircraft violated Pakistani airspace and two Pakistani jets intercepted them. They said one jet was shot down over the Pakistani town of Miram Shah. They said the pilot bailed out and landed in Pakistani territory uninjured. Islamabad also said the downed plane could have been either an F-16, which is one of the most advanced American-made fighters, or an older Chinese-designed F-6 jet."

"Pakistani jet fighters shot down an intruding Afghan warplane today and Afghan aircraft bombed three Pakistani villages near the Afghan border, Pakistani authorities said.

Several Afghan aircraft flew into Pakistani airspace and were fired on by two Pakistani Air Force fighters, a Defense Ministry spokesman said.

He said the Afghan jet was downed 12 miles inside Pakistan, over Nawagai, 120 miles northwest of Islamabad."

The missile barely left the fighter when the pilot ejected and after a few seconds the plane exploded and the wreckage fell 10 NM from Thal on the bank of river Kuram. The afghan pilot was later handed over to the afghan Gov.

"Thirty people were killed when an Afghan transport plane was shot down by Pakistan on Saturday, a broadcast on the Afghan Government radio said today.

It said the pilot had lost his way because of a technical problem during a flight from Kabul, the Afghan capital, to Jalalabad in the east and that he had sought help from the nearest airport in Pakistan.

''Not only was no help provided, the plane was shot down by the Pakistan Air Force,'' according to the broadcast, monitored in Islamabad.

The Pakistani Defense Ministry said Sunday that an intruding Afghan plane was shot down by ground fire near the northwestern town of Parachinar and that everyone on board had been killed. A ministry statement did not identify the aircraft or say how many people had died."