The Taliban bomber was not searched when he entered the camp.
The suicide bomber who killed seven CIA agents in Afghanistan this week was courted by the US as a possible informant.
The BBC reported:
The suicide bomber who killed seven CIA agents in Afghanistan had been courted by the US as a possible informant, US intelligence sources have said.
They said he had not undergone the usual full body search before entering the base in Khost province, and so was able to smuggle in an explosive belt.
The attack was the worst against US intelligence officials since the US embassy in Beirut was bombed in 1983.
US President Barack Obama has praised the work of those killed in a letter.
Paying tribute to the fallen, Mr Obama said those killed were “part of a long line of patriots who have made great sacrifices for their fellow citizens, and for our way of life”.
He told CIA employees in a letter that the victims had “taken great risks to protect our country” and that their sacrifices had “sometimes been unknown to your fellow citizens, your friends, and even your families”.
Jules Crittenden has more on the attack.
