Tel Aviv, Israel, Feb 26, SPA -- A Palestinian blew himself up in a crowd of young Israelis waiting outside a nightclub near Tel Aviv's beachfront promenade, killing at least four people, wounding dozens and shattering an informal Mideast truce. The blast, just before midnight Friday, ended severalweeks of calm and presented the first serious test to theunofficial cease-fire declared by Israeli Prime MinisterAriel Sharon and Palestinian leader Mahmoud Abbas on Feb. 8at a dramatic summit in Egypt. Israeli officials indicated the attack would not derailthe tentative peace efforts. But the bombing put newpressure on Abbas to take action against extremists, whohave not formally accepted the truce. The Palestinians must "do much more to prevent suchattacks," said Gideon Ezra, the Israeli public securityminister. Despite the violence, he said contacts with thePalestinians should continue.--MORE1046 Local Time 0746 GMT www.spa.gov.sa/242400