TACOMA, Wash. (AP) — A fourth electrical substation was vandalized late on Christmas Day in Washington state, leaving homes in Kapowsin and Graham temporarily without power, according to the Pierce County Sheriff's Office.

By 7 a.m. Monday, more than 10,500 Puget Sound Energy customers were without electricity across the region, KOMO-TV reported.

The suspects broke into a fenced area and vandalized equipment, causing a fire, officials said. The fire was extinguished and power was later restored, but no suspects are in custody, officials said.

The attacks come as federal officials are warning t...