SEATTLE — A sixth soldier was charged yesterday in connection with what Army prosecutors have described as the sport killings of three Afghan civilians last year, officials at Joint Base Lewis-McChord near here said.

The soldier, Staff Sergeant David D. Bram, was charged with solicitation to commit premeditated murder, engaging in murder scenario conversations with subordinates, aggravated assault with a dangerous weapon, planting evidence near the body of an Afghan national, and failing to report crimes including murder.

The Army did not release more details, but Bram has often been mentioned in testimony by witnesses in the case, including other soldiers who have been charged with murder. In January, in a plea agreement, Specialist Jeremy N. Morlock said Bram gave him clearance to commit the first of the three killings, in January 2010.

In March, Morlock was sentenced to 24 years in prison for his role in all three killings. Bram watched the proceeding in the same room as reporters who were covering it.

Four other soldiers await court-martial proceedings in the case.

Bram had already faced lesser charges, along with six other soldiers from the same unit, part of a Stryker Brigade deployed near Kandahar in 2009 and 2010. The earlier charges include striking a soldier who many in the unit had worried would tell superiors about their crimes.

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