AP Photoy GREETED BY A large reception, Reagan waves to the crowd after his arrival in France.} Reagan, Mitterand say fighting must end In Brief Compiled from Associated Press and United Press International reports Israeli ambassador attacked, critically wounded in London LONDON- The Isreali Ambassador to Britain, Shlomo Argov, was shot and critically wounded Thursday night in an assassination attempt outside a London hotel, police and Foreign Office sources reported. They said Argov was taken alive to London's Westminster Hospital, and that Argov's assailant was shot and wounded by police of Scotland Yard's Diplomatic Protection Group after the attack on the ambassador outside the Dorchester Hotel. A Scotland Yard spokesman said Argov was in critical condition, but gave no other details. He said the suspected assailant was "detained under guard" in a central London hospital, but did not disclose the man's condition or identify him. The spokesman said that, soon after the shooting, police arrested two people in acar and "a weapon was recovered" in the south London district of Brixton across the River Thames from the swank Mayfair district where the Dorchester is located. House to vote on Reagan budget WASHINGTON- Democratic leaders gave President Reagan a hollow and potentially embarrassing victory yesterday by moving his original- and foredoomed-budget to the House floor. "I don't take any pleasure in embarrassing the president of the United States," insisted House Speaker Thomas O'Neill (D-Mass.) Nonetheless, he predicted that if Reagan's plan does come to a final vote, it will be "overwhelmingly demolished." According to plan, the Democratic-controlled House Budget Committee met yesterday and on a voice vote reported out the president's original budget-submitted to Congress in February-for use as a vehicle for debate in the full House next Wednesday. O'Neill had said the panel would send the Reagan budget to the floor with the recommendation that it be defeated, making room for Democratic and Republican leaders to offer separate substitutes to- the administration package. However, the recommendation for defeat was dropped, a Democratic aide said, to avoid the appearance of "rubbing it in." Airlines post higher fares for former Braniff routes NEW YORK- Higher fares posted by three airlines on routes once served by defunct Braniff International will be closely watched by other hard- pressed carriers who hope to raise fares and keep them up. The key questions are whether passengers will pay the higher fares plan- ned by American Airlines, Trans World Airlines and Pan American World Airways-and whether airlines can resist price-cutting if passengers stay away. American said fares on 650 of its 1,400 domestic routes would go up June 18, some up to 30 percent. Many of those routes serve the Dallas-Fort Worth market, where Braniff is based. Announcement of the higher fares came three weeks after Braniff, a heavy discounter of fares, suspended operations and filed for protection from creditors under federal bankruptcy law. May auto sales up 11.4 pereent DETROIT - Sales by the nation's five automakers rose 11.4 percent in May - the first monthly increase in the 1982 model year - while sales of imports dropped nearly 10 percent. Analysts were careful to term the increase in U.S. sales a "modest up- turn" and credited the hike to rebates and other incentive programs offered by the firms. Total U.S. sales of 584,074 were up from 524,021 in May, 1981. It was the fir- st monthly sales increase since last September. There have been no monthly sales hikes since the model year began in October. Sales rose 8.2 percent for the automakers in the final 10 days of the month - the third straight period in which sales have gone up. World War I nerve gas leak threatens Louisiana conmmunity WESTLAKE, La. - Worried neighbors said Thursday chemical leaks were too frequent at the Olin Chemical Co. plant where escaping phosgene, a nerve gas used in World War I, killed a truck driver and injured 58 workers. Phosgene, which is used by Olin as an industrial catalyst, spewed into the air for 2% minutes Wednesday, but company officials insisted there never was any threat of a "major disaster." Loretta Abshire, whose father works at a nearby Conoco plant where workers were overcome, said Olin was too slow to notify its neighboring plant wo workers could be evacuated. PARIS (AP) - President Reagan and French President Francois Mitterrand agreed yesterday that fighting in the Middle East and the Falkland Islands must be halted quickly, but they made no move to resolve their own quarrel over economic difficulties. Over an elegant lunch at the Elysee Palace marking the formal start of Reagan's 10-day European tour, the two leaders deferred tackling sensitive economic issues until the summit of seven major industrial democracies begins tonight at Versailles. THE FRENCH are particularly critical of what one senior official in advance of the meeting called "this frenzy on Soviet credits" - a reference to U.S. opposition to low-interest credits for Soviet purchase of West European industrial goods. Secretary of State Alexander Haig, told reporters the credits issue did not surface at the Reagan-Mitterrand meeting, which lasted nearly two hours, and that he hoped it would not become a "spoiler" at the summit con- ference. "All in all," said Haig, "it was a very successful first day." He said Reagan and Mitterrand enjoyed "an unusual relationship" characterized by "in- timacy and mutual confidence and frankness in their exchange of views." Haig said the two leaders agreed that the war between Iran and Iraq must not be allowed to spread to other areas of the Middle East, which would threaten "grave consequences," and should be ended as soon as possible. Soviet credit deba ted at Versailles summit VERSAILLES, France (UPI)- Soviets help with military technology, France squared off yesterday against a but they are not ready to take economic U.S. attempt to cut off easy credit to the sanctions." Soviet Union-an early indication Reagan wants to use this weekend's President Reagan faces tough op- seven-nation summit of economic allies position at the Versailles Economic to win an agreement making it harder Summit. for the Soviets to borrow money from "France is against putting Soviet the West to finance projects like the $15 credits on the agenda as the Americans billion natural gas pipeline from want to do," a well-placed government Siberia to Western Europe. source said. Both France and West Germany have "FRANCE believes credits to the provided easy credit terms to the Soviets have global dimensions. The. iRussians in hopes of getting a steady ''rench -are-opposed-to giving the .fuuie energysupply.