The killings have reignited fury at the US' presence in Afghanistan following a wave of deadlyprotests over US citizens burning Qurans last month.

The Taliban claimed responsibility for several attacks that the group said were retaliation forQuran burnings. Afghan forces also killed six US troops as violent protests wracked the country.

The attack raises questions again over why US troops are still fighting in Afghanistan after 10years of conflict and the killing of Osama bin Laden.

US President Barack Obama and top US officials quickly condemned the attack and offered their condolences to families of the victims.

US-led forces in Afghanistan have stepped up security, and the US embassy has also warned US citizens in Afghanistan about the possibility of reprisals, said the AP.

According to the AP, in results from a Washington Post-ABC News poll released on Sunday, 55 percent of respondents said they think most Afghans oppose what the US is trying to do there. And 60 percent said the war in Afghanistan has been "not worth fighting".

Questions:

1. What time did the attack by the US staff sergeant occur?

2. How many soldiers are in custody?

3. What do 60 percent of respondents of the Washington Post-ABC News poll say?

Answers:

1. 3am Sunday.

2. One.

3. That the war in Afghanistan has been “not worth fighting”.

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