Palestinian suicide bomber kills 19

JERUSALEM - A Palestinian detonated nail-studded explosives on a Jerusalem bus crowded with high school students and office workers today, killing himself and 19 passengers in the city's deadliest suicide attack in six years. Fifty-five people were wounded. The extremist Islamic group Hamas claimed responsibility for the attack. Meanwhile, President Bush may send Secretary of State Colin Powell to the Middle East to try to promote peace efforts that were set back by the suicide blast.