By Brett Wilkins

Afghans and human rights advocates around the world expressed deep disappointment Tuesday after the European Court of Human Rights ruled in favor of Germany in a case brought by victims of a 2009 NATO airstrike that killed as many as 90 civilians.

The New York Times reports a 17-judge panel of the ECHR ruled unanimously that the German government adequately investigated a September 3, 2009 airstrike in Afghanistan's Kunduz province that targeted two fuel tankers stolen by Taliban fighters. Believing the militants might use the trucks as a mobile bomb, Col. Georg Klein, the German commanding officer of a nearby NATO base, ordered U.S. warplanes to destroy the vehicles.

According to German broadcaster Deutsche Welle, prosecutors said Klein made several calls to an informant to ensure there were no civilians present before the strike. However, scores of Afghan civilians including children flocked to the trucks—which were stuck on a sandbank in the Kunduz River—to siphon off fuel at the Taliban's invitation.

A German military investigation later found that as many as 90 civilians died in the massive explosion caused by the strike. The probe concluded that no charges should be brought against Klein.

Tuesday's ECHR ruling stated that Klein "had not incurred criminal liability mainly because he had been convinced, at the time of ordering the airstrike, that no civilians had been present at the sand bank." Klein was promoted to general in 2012.

The court also found there was "no violation" of Article 2 of the European Convention on Human Rights, that it "had no reason to doubt" Germany's assertion that it thoroughly investigated the airstrike as required under the charter, and that Klein had "not acted with the intent to cause excessive civilian casualties."

The court's findings gave no comfort to plaintiff Abdul Hanan, a farmer whose sons Abdul Bayan and Nesarullah—ages 12 and eight, respectively—were killed in the strike.

"They martyred a hundred people, they bombed us unjustly, so how can they come to this unjust decision?" Hanan told the Times after the ECHR ruling. "Is our blood worth less than the blood of a German?"

"I wanted the court to provide justice, to have mercy on us," Hanan added.

In the aftermath of the mass killing, Germany offered $5,000 payments to families of civilians who died or were seriously injured in the strike. Hanan sought additional damages, as well as an admission by German officials that they failed to protect civilians. The German government argued that it was not legally responsible for the deaths since the airstrike was executed on behalf of the United Nations.

Last December, Germany's constitutional court ruled that the country was not liable for the civilian casualties.

According to the Costs of War Project at Brown University's Watson Institute, more than 43,000 Afghan civilians have been killed during the U.S.-led war in Afghanistan, now in its 20th year. Taliban militants have killed the most noncombatants, but thousands of men, women, and children have also been killed by U.S., allied, and Afghan government bombs and bullets.