Top officials say they have arrested two Afghan government employees for alleged involvement in a plot to kill President Hamid Karzai.
Defense Minister Abdul Rahim Wardak says the police nurse and Defense Ministry weapons expert supported the gunmen who targeted Karzai at an April 27 military parade in Kabul.
Karzai escaped unharmed but three other people, including a lawmaker, died.
Wardak told a Sunday news conference that two assault rifles used in the assassination attempt were government-issued weapons.
Intelligence chief Amrullah Saleh still blames al-Qaida-linked militants based in neighboring Pakistan for hatching the plot.
He has called on Pakistan to put pressure on militant safe havens in its lawless tribal areas.