The police officers are on the street.
The Pierce County Sheriff's Department received a call just before 6 a.m. on Sunday about a break-in at a public utilities substation in Graham, Washington.
The second public utilities substation in Graham was attacked hours later along with a Puget Sound Energy substation.
More than 500 households in the area lost power after a fourth attack on a Graham power station broke out on Sunday night.
Residents are being asked to check their security cameras and report any suspicious activity between 2 a.m. and 6 a.m. It was Saturday.
Police said on their Facebook page that they are aware of other attacks on power stations in Oregon, Washington and North Carolina.
According to CNN, on November 22, the FBI sent out an internal bulletin warning of threats to electricity infrastructure by racially or ethnically motivated domestic extremists. The Department of Homeland Security warned in January that domestic extremists were planning to attack the nation's critical electricity infrastructure for at least two years.
More than 50,000 customers were left without power in Moore County, North Carolina, after two substations were attacked by gunfire. Law enforcement sources told CNN that the attacks may be linked to posts in online forums encouraging attacks on critical infrastructure and a wave of domestic extremists targeting gay and lesbian events. In late November, there were attacks on substations.
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