East Germans block routes to West BERLIN (UP1) East Germany closed West Berlin's main highway link with the West for almost two hours yesterday, effectively demonstrating the Communist grip on the city's lifelines. The East Germans also began a slowdown at other traffic checkpoints that delayed motorists for as long as six hours and lined up autos for five miles in Berlin and at exit points to West Germany. The measures, neither explained nor announced in advance, followed Communist threats against the city because of the West German presidential election scheduled here March 5. East German police also announced a schedule for construction work on the key Babelsberg checkpoint road that will necessitate traffic diversions there Feb. 27, the day President Nixon is to visit the city, and on the eve of the election. The schedule also called for work on the guarded, two-mile stretch of road between the city and the checkpoint for today, next Friday, and Feb. 25. "They are just making the point again that they can control traffic as they want," said a West Berlin police captain. "We probably can expect more of this sort of thing through the March 5 election." Western officials said the Communists may also be trying to test Nixon's mettle by using the West German elections, which have been held here previously, as an excuse for harassing this vulnerable Western outpost. Militant leftist students in West Berlin, who already have announced plans to demonstrate against Nixon, announced yesterday they would block the city's highways to the West March 5 if the East Germans fail to close them. Israeli jet fired on at Zurich airport ZURICH (UPI) — Four Arab commandos opened fire with submachine guns yesterday on an Israeli El Al airliner taxiing for takeoff on a flight to Tel Aviv with 22 persons aboard. The burst of fire from outside the fence at Kloren International Airport slightly wounded four passengers on the Boeing 720B and seriously wounded two crewmen, according to District Attorney Joerg Rehberg. One passenger, "presumably a security officer," leaped from the plane and returned the fire, hitting one of the Arabs in the head and killing him instantly, Rehberg said. The three surviving commandos, including one woman, were seized. The Popular Front for the Liberation of Palestine (PFLP), an Arab guerrilla organization, said in Beirut, Lebanon, it was responsible for the attack. A similar attack on an Israeli plane in Athens last December, which the FLPF also claimed, led to an Israeli retaliatory assault on Beirut airport that destroyed 13 Arab planes. At the United Nations, Secretary General U Thant deplored the Zurich attack as "dastardly" and urged Israel not to retaliate this time. "If the hitherto peaceful world of civil aviation is to be saved from chaos and anarchy, governments and peoples, regardless of their political views, must condemn acts of this kind and take all possible 10 KANSAN Feb. 19 1969 measures to prevent them," Thant said in a statement. The U.N. Security Council condemned Israel's raid in December on the Beirut airport. Israel's commercial aviation security committee was expected to hold an emergency meeting last night to plot its reaction to the new flareup in Middle East tensions. The plane was flight 432 from Amsterdam to Tel Aviv and had made an intermediary stop at Zurich's Kloten International Airport. The aircraft was fired on when it taxied to take off from a runway. The assailants opened submachine gun fire from a Volkswagen, parked outside the airport grounds while the jet passed about 300 feet away. The district attorney said the four wounded passengers were treated at hospitals and released. Both crewmen were admitted. Pilot trainee Itzhak Barzilai underwent surgery for a stomach wound. The second wounded crewman, a pilot, was hit in the hand. "The submachineguns with which the four assailants opened fire on the Israeli airliner were presumably of Soviet origin," district attorney Rehberg said. Da Nang attack feared SAIGON - Thousands of Communist troops moved into the mountains around Da Nang during the allied Tet truce, positioning themselves for an attack against South Vietnam's second largest city, U.S. Marine intelligence sources said yesterday. TAKE A BOWLING BREAK AT THE JAYBOWL Thursday night special—Beat the Best! Each Thursday night, one of KU's best bowlers will be chosen to bowl against all comers. Each game your handicap score Beats the Best, you bowl free! (Women will be given 50 pins handicap each game-men receive 25 pins.) Should you lose, you pay only the ordinary rate for bowling-40c per game. This Thursday, try to Beat the Best-it's great for competition and fun! 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