They promised to take action against the people responsible, but didn't give any further details.
Mr Sharon left the US earlier than expected after the attack, but it is thought that US proposals for summer conference to discuss the Middle East may still be successful.
Things had been getting better
It's a real blow because the situation was beginning to improve in the area, with no suicide bombings for close to a month, and Arafat allowed to leave his Ramallah base.
But there have been problems with attempts to end the siege of the Church of the Nativity in Bethelehem, because no country is prepared to allow 13 Palestinian militants still inside to live in their country.