Later, the coalition reported that a soldier with the Afghan National Army turned his weapon on coalition troops in the west, killing two in the most recent of so-called insider attacks.
Another coalition service member was killed in an insurgent attack in northern Afghanistan.
The attacks come about a week after the Taliban announced the start of their spring offensive.
The renewed violence came as Afghan President Hamid Karzai acknowledged at a news conference that regular payments his government has received from the CIA for more than a decade would continue.
Karzai also said that talks on a U.S.-Afghan bilateral security agreement to govern future American military presence in the country had been delayed because of conditions the Afghans were placing on the deal.
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