Arizona, Jan. 4 -- A private helicopter crashed in a rugged, mountainous region of central Arizona on Friday, killing all four people on board, local authorities confirmed.

According to the Pinal County Sheriff's Office, the victims included the 59-year-old pilot, two women aged 21, and another woman aged 22. The identities of those killed have not yet been made public, pending notification of their families, reported Kens5.

The crash occurred at approximately 11 a.m. near Telegraph Canyon, a remote area located about 64 miles east of Phoenix. Preliminary information indicates the helicopter may have struck a recreational slackline stretched across the canyon. Authorities said the line extended more than half a mile across the mountaino...