KHOST: Afghan and US forces have arrested a suspected would be suicide bomber who is allegedly from the neighbouring Pakistani tribal region, local officials said on Wednesday. "In a joint operation on Tuesday we arrested a Pakistani national who was attempting to carry out a suicide attack in Khost city," said Abdul Ghafar, top intelligence official in the violence-plagued eastern province. Ghafar said the suspect came from the tribal region of Waziristan. Waziristan is known to be a hub of Taliban and Al-Qaeda militants. He said the suspect was also connected to an incident last month in Khost when security forces seized an empty car filled with explosives that they said was to be used in an attack.