SAN JACINTO, Calif. (AP) — A man and woman opened fire on guards at an entrance to an American Indian reservation and fled into its hilly interior, where they were killed in a gunbattle with sheriff's deputies and a SWAT team, authorities said Tuesday. It was the second deadly gunfight involving deputies on the reservation in five days.

The motive for the Monday night attack was unknown, said Riverside County Sheriff's Department spokesman Dennis Gutierrez. The guards were unhurt, as were the officers involved in the shootout.

The attackers fled seven miles up a dirt road into the reservation, where they were eventually killed in a standoff with five deputies and four members of a SWAT team, Gutierrez said. He would not say how many shots were fired.