Attacks on three utility stations in Washington state Sunday shut down power to 14,000 customers, officials reported.
Nothing was stolen, but equipment was vandalized, causing the power outages. No suspects were in custody as of Sunday evening.
“It is unknown if there are any motives — or if this was a coordinated attack on the power systems,” the Pierce County Sheriff’s Office said in a statement.
The U.S. Department of Homeland Security issued a national terrorism alert last month warning that critical infrastructure in the nation could be targeted in possible attacks by “lone offenders and small groups motivated by a range of ideological beliefs and/or personal grievances.”