Islamabad, Pakistan (CNN) -- A high court in Pakistan on Monday refused to decide whether a CIA contractor accused of killing two Pakistani men has diplomatic immunity, sending the case back to a lower court, the official Associated Press of Pakistan reported.
The lower court has already ruled that Raymond Davis does not enjoy protected diplomatic status because neither he nor the Pakistani government has provided documents proving that he has diplomatic status.
Davis has not been formally charged.
The case has strained relations between the United States and Pakistan, a key ally in efforts against al Qaeda and the Taliban in neighboring Afghanistan, and the shooting deaths have outraged many Pakistanis.
Davis has said the January 27 shooting occurred after two men attacked him as he drove through a busy Lahore neighborhood, according to the U.S. Embassy.
U.S. officials originally said Davis was a diplomat and later revealed that he is a CIA contractor, intensifying the already highly charged situation.
The United States is seeking his immediate release on the grounds that he has diplomatic immunity.