LOS ANGELES — Police in suburban Los Angeles say they've made multiple arrests in the hit-and-run deaths of three teenage girls who were trick-or-treating on Halloween, but few other details have been released.

Authorities in Santa Ana had been looking for the driver and another person who fled the scene of Friday evening's crash, which claimed the lives of 13-year-old twins and a 13-year-old friend at a crosswalk. A damaged black Honda SUV was found a short distance from where the collision occurred.

Santa Ana police said officers made the arrests Sunday but declined to provide an exact number of arrests or other details ahead of a news conference scheduled for sometime today.

A witness told the Los Angeles Times the girls were wearing costumes with black leggings and dark clothing when they were hit.

Two of the girls were declared dead immediately, and a third died as paramedics prepared to take her to a hospital, Orange County fire Capt. Steve Concialdi said.

The twin sisters were Lexi and Lexandra Perez, and the third victim was Andrea Gonzalez, the Orange County Sheriff's Department said.

MOJAVE, Calif. — Investigators say Virgin Galactic's experimental spaceship broke apart in flight over California's Mojave Desert after a device to slow the craft's descent prematurely deployed.National Transportation Safety Board acting chairman Christopher Hart said Sunday that while no cause for Friday's crash has been determined, investigators found the “feathering” system was activated before the craft reached the appropriate speed.The system requires a two-step process to deploy. The co-pilot unlocked the system but Hart said the second step occurred “without being commanded.”Hart said the SpaceShipTwo's fuel tanks and engines showed no signs of being compromised.The co-pilot was killed. The pilot parachuted to the ground and is hospitalized.