A roadside bomb killed two NATO soldiers in Afghanistan, as the alliance decided to increase its forces in the country to overcome a resurgent Taliban.
Tuesday's attack struck a combat patrol in Logar province, about 60 km (40 miles) south of the Kabul, NATO said.
The Taliban has launched a wave of attacks in recent days, killing six NATO soldiers in the past week.
On Monday, two Canadian soldiers died when a suicide bomber rammed his car into their convoy in the southern city of Kandahar.
NATO leaders at a summit in Riga will declare their determination today to prevail over the Taliban, but the increase in troop numbers is only small.
Afghanistan was the sole focus of Tuesday's working dinner at the summit in the Latvian capital, and many of the 26 member nations expressed hope the most dangerous ground mission in NATO's 57-year history could yet succeed.
A NATO spokesman said three countries had pledged more troops and a majority had agreed to ease restrictions on where and how their forces could fight in Afghanistan.