Representatives from 20 countries joined aid agency members at the Istanbul talks almost 10 years after the Taliban were driven out of power in Kabul.

"To restore security in Afghanistan genuine solidarity is a must," Turkish President Abdullah Gul said in opening remarks.

The summit will aim to chart the way ahead for Afghanistan, with the US-led Nato mission already locked into troop draw-downs that are scheduled to bring all foreign combat troops home by 2014.

The gathering takes place a day after a trilateral summit hosted by Gul brought together the presidents of Afghanistanand Pakistan in a bid to ease tensions and promote cooperation between the two neighbours.

Tuesday's talks saw Afghanistan and Pakistan agree to cooperate with an investigation into the murder of former Afghan leader and peace negotiator Burhanuddin Rabbani.