The emergency summit of European leaders last night closed ranks to present a united front with the US as Tony Blair predicted widespread international support for George Bush's ultimatum to the Taliban regime.  Flying to Brussels from talks with Mr Bush in Washington, the prime minister joined European Union colleagues in signalling determination to accept their share of the burdens in the war against global terrorism.  At the end of Mr Blair's 9,000-mile round trip, Downing Street officials dismissed predictions that European sol idarity would start to crumble once military action starts. All governments are now stating that short-term attacks against Osama bin Laden and his associates are only part of a long-term, two-strand agenda to destroy the "terrorist machine".  The 15 leaders endorsed a series of practical measures which would tighten police and intelligence cooperation; clampdown on the financing of terrorist networks, including asset freezing; and improve airline security.  A parallel meeting of finance ministers in Liege was working to minimise the deflationary impact of the attacks on the fragile world economy.  British officials confirmed that new legislation could be required as Whitehall makes a fresh attempt to ease "the red tape around extradition".  Officials are aware that past bills, including the Terrorism Act of 2000, have proved cumbersome or ineffectual. The current crime bill may be used to adapt existing laws.  "We would expect in the com ing session of parliament there to be possibly some new primary legislation in relation to terrorism, such as extradition," Mr Blair's spokesman said.  EU diplomats made clear that the union is not involved as an organisation in military planning, and that any participation is a matter for individual member states.  But the US is actively seeking EU help in bringing Iran and Syria into the emerging anti-terrorist coalition President Bush wants to build.  EU leaders were paying special attention to the need to close down funding for terrorist groups by tracking financial transactions and money-laundering routes.  The ceasefire between the Israelis and Palestinians was the subject of separate talks.  Underlining security concerns, Belgian police sealed off the EU area of Brusselsand banned jets from flying over the capital. Rumours, which proved false, swept the city that terrorist attacks had been mounted in France and the Netherlands.  The leaders of Sweden and Finland - both non-Nato countries - yesterday expressed support for the US but urged caution.  British officials stressed that Mr Blair is convinced by his conversation that Mr Bush attaches great importance to a wide coalition. Classification Language: ENGLISH Subject: TERRORISM (91%); TERRORIST ORGANIZATIONS (90%); LEGISLATION (90%); TERRORIST ATTACKS (89%); EUROPEAN UNION (89%); WAR & CONFLICT (89%); COUNTERTERRORISM (89%); INTERNATIONAL ECONOMIC ORGANIZATIONS (89%); EXTRADITION (87%); PRIME MINISTERS (78%); TALKS & MEETINGS (78%); HEADS OF STATE & GOVERNMENT (78%); BRITISH PRIME MINISTERS (78%); PEACE PROCESS (78%); LEGISLATIVE BODIES (77%); AVIATION SECURITY (76%); PUBLIC FINANCE (76%); TALIBAN (72%); PUBLIC FINANCE AGENCIES & TREASURIES (72%); ASSOCIATIONS & ORGANIZATIONS (72%); MONEY LAUNDERING (71%); DIPLOMATIC SERVICES (71%); DEFLATION (67%) Company: EUROPEAN UNION (58%); EUROPEAN UNION (58%) Organization: EUROPEAN UNION (58%); EUROPEAN UNION (58%); EUROPEAN UNION (58%); EUROPEAN UNION (58%) Industry: AVIATION SECURITY (76%); AIRLINES (72%); PUBLIC FINANCE AGENCIES & TREASURIES (72%); DEFLATION (67%) Person: TONY BLAIR (79%); OSAMA BIN LADEN (72%); GEORGE W BUSH (58%) Geographic: BRUSSELS, BELGIUM (78%); UNITED STATES (94%); UNITED KINGDOM (93%); BELGIUM (93%); EUROPE (93%); EUROPEAN UNION MEMBER STATES (92%); FRANCE (79%); SWEDEN (79%); IRAN, ISLAMIC REPUBLIC OF (79%); SYRIA (79%); FINLAND (79%); NETHERLANDS (79%); ISRAEL (79%); STATE OF PALESTINE (79%)