PROVO, Utah (UPI) — Officers armedwith rifles searched through mud fieldsnear Utah Lake today for traces of the grenade - carrying man who pulled off the most expensive hijacking in domestic airline history and jumped into the cold night with a bugged parachute and $500,000 in cash.Search coordinator Jess Evans, theProvo police chief, said a radio signal from a parachute supplied the hijacker at the San Francisco airport Friday had been located in the area betweenInterstate 15 and the Provo city airfield.where the mud is as deep as eight feet inplaces.More than 100 rifle - bearing officers from local police forces, the Utah County Sheriff’s Department and the UtahHighway Patrol joined FBI agents in thesearch, which had been delayed earlierbecause of darkness and the wet ground.“We were just destroying any tracks there were in the area.” Evans said.The United Air Lines Boeing 727 landedsafely in Salt Lake City late Friday nightand police headed into the region to look for “T. Johnson.” the name the hijackerused to buy his ticket.Hijacker Dons Jumpsuit“It would seem that the hijacking was well thought out. well planned and he obviously had knowledge of parachutes,” said a United official. The hijacker donned a jumpsuit just beforeparachuting out.It was the highest ransom ever paid in aU.S. skyjacking. The highway patrol saidthe money was in a black attache case and included 5,10,20, and 100 dollar bills.The man, described as 30, white, medium build and wearing a wig and fake mustache, carried out the crime withoutleaving his seat, after he ordered the captain to land at San Francisco. He handed typewritten notes to a stewardess who carried them to the pilot.Earlier the airline said the hijacker bailed out over Nevada, but the report proved erroneous. The company said it was an “honest mistake” because thepilot radioed when he saw a signal light flash on to indicate the rear exit was open.The hijacker took over the plane a few minutes after it left Denver for LosAngeles. He forced it to fly to San Francisco where $500,000 and severalparachutes were loaded aboard and the passengers allowed to disembark 3M hours later.Plan* Takas OffThe plane then took off and flew northover the snowy Sierra Nevada, then eastover Nevada and Utah where the hijackerparachuted out and disappeared into thenight“I saw him open a bag he had and takeout a hand grenade and put it in his coatpocket. My heart jumped,” said JosephZaleski, a passenger sitting across theaisle from the hijacker.A stewardess said the hijacker sent anenvelope to the pilot containing the pinfrom a grenade.The 95 passengers and crewmen aboard the plane sat inside during most of the 312 hour ordeal on the ground at SanFrancisco, in which the hijacker pressedcrewmen and a convict who was beingtransferred to San Quentin Prison intoservice.TINY VOLCANO. — Volcanoes come in all sizes, and thisone, on the surface of a soil particle from the Apollo 12 lunarexploration, measures about 1-10,000th of an inch in heightformed in a hot process — reaching temperatures of 500 to 600 degrees C, perhaps during a meteorite impact on the lunar surface. The “volcanic eruption” occurred becauseIt was photographed with a scanning electron microscope atthe National Bureau of Standards in Washington. D Cmetals inside the particle cooled more slowly than the glassy materials on the outside —UPI.Scientists think the structure resulted as the particle wasSAIGON (UPI)USfighter -bombers and B52s struck at Communistmilitary targets for the third day in the border in Cambodiarow However, storms were moving intoAlthough the Communist forces madeforces battling South Vietnamese troopsnorth of Saigon today in an effort to stopthe offensive that already has overrun onethe area and were expected to curtail the bombing and strafing of antiaircraft and surface-to-air (SAM) missile sitesheadway Friday in a two-pronged attack75 miles from Saigon by taking Loc Ninh,major outpost 75 miles from the capital. An American base came under attackWithfor the first time since the North Vietnamese offensive began. Communist forces poured 150 mortar shells into theU.S. Army radio relay station on 3,235-footBlack Virgin Mountain Nui Ba Den only 55 miles northwest of Saigon, wounding four Americans.just about every possible American plane in the air. Communist fire was taking its toll The U.S. commandthe South Vietnamese said they may have stalled the North Vietnamese offensive atQuang Trireported that in three widely separated incidents groundfire downed twoAmerican helicopters and another waschased off from a rescue attempt In the Central Highlands north of Saigon, where fighting also was underSeek host familiesFamilies in this area who would be“TheFighting was under way both north and south of Saigon and the Cambodian high command said that strategic Highway 1 between Phnom Penh and Saigon was cut by North Vietnamese troops.In the area between Saigon and the Cambodian border, where the Communists overran the town of Loc Ninhway in the Communist’s multi - prongedoffensive, an OH6 Loach light observationplane flying support for South Vietnamese forces was shot down east of Pleiku but itstwo-man crew was rescuedTwo crewTnen of an AH1 Cobra was notso fortunate Their rocketfiring gunship went down Friday morning whileinterested in participating in Experiment in International Living” are being asked to register their interest assoon as possible with Robert Day, Washington attorney who is hoping to arrange home stays for foreign college students this year.About 3,000 foreign college students areexpected to seek “home stays” in the