Afghan President Hamid Karzai heads to Washington Monday for talks with President Barack Obama that will focus on Afghanistan's future after U.S. forces withdraw next year.

Ahead of his visit, Mr. Karzai met in Kabul with a delegation of visiting U.S. senators. His office said the meeting Saturday focused on a range of issues — including the security pact between the two countries and the peace process in Afghanistan.

Meanwhile, officials in southern Afghanistan say a twin suicide attack Sunday killed five people and wounded at least 15 others.

Authorities say the two bombers attacked a meeting of tribal elders in the town of Spin Boldak in Kandahar province.

The Taliban claimed responsibility for the attack.