Two new inquiries will examine Britain's role in the Afghanistan war after leaked US military documents provided new evidence of unreported civilian casualties.

The defence select committee said that issues it would look at in the first inquiry include the justification for Britain's continued participation in the nine-year war, the reporting of civilian casualties and the timetable for withdrawal. The second inquiry will examine the context for a political settlement in Afghanistan, it said in a statement.

Britain currently has 9,500 troops in Afghanistan, with 325 killed since the war began in 2001. Prime Minister David Cameron last week said British troops could start withdrawing as early as next year, part of a plan to draw down the bulk of the troops by 2015.