The media group blames British soldiers in a raid that rescued New York Times journalist Stephen Farrell and killed assistant Sultan Munadi.
A negotiated release was possible says Red Cross, but released New York Times reporter Stephen Farrell said the conditions of their captivity were growing "menacing."
Troops rescued Stephen Farrell four days after he and his translator were abducted in Kunduz Province. But the translator, Sultan Munadi, was killed, and civilians may have died in the firefight.
The deadliest use of force by German troops since World War II has ignited a debate among an increasingly skeptical electorate.
The attack, which killed at least 90 people near two Taliban-hijacked trucks, is a setback for NATO's push to limit civilian deaths.
NATO forces meet light resistance in Helmand Province, but Afghan insurgents hit back in other parts of the country. Are more US troops needed?
Christians meet underground in a country where official churches do not exist.