South Korea said Friday it cannot determine whether the shooting death of a South Korean tourist at a resort in North Korea was accidental.

The South’s fact-finding commission chief Hwang Boo-gi said his team cannot resolve numerous questions about the July 11 shooting because the North refuses to allow investigators into the Diamond Mountain resort.

To find out whether the shooting was accidental, Hwang told reporters, his team needs to know from what location the North Korean soldier fired shots at the 53-year-old housewife and other details.

The North has said an army guard shot her, claiming that she entered a restricted military area and ignored a warning to stop. South Korea suspended its decade-old mountain tour program in response.

North Korea expressed regret over the death but denounced the South for unilaterally halting the program.

The shooting worsened already-strained ties between the two Koreas, which are still technically in a state of war.

The North had before cut off all government-level dialogue with the South since a pro-U.S., conservative government took office in Seoul in February.