(CNN) The Oregon state Senate canceled its Saturday session after state police deemed the safety of lawmakers was threatened.

CNN affiliate KOIN reports the cancellation comes over concerns of militia groups gathering at the state Capitol, and Oregon State Police Captain Tim Fox said in a statement that state police and partner agencies "are planning accordingly."

"We have been monitoring information throughout the day that indicates the safety of legislators, staff and citizen visitors could be compromised if certain threatened behaviors were realized," Fox said in a statement released Friday and obtained by CNN Saturday.

"It is absolutely unacceptable that the Senate Republicans would turn their back on their constituents who they are honor-bound to represent here in this building," Brown said in a statement at the time. "They need to return and do the jobs they were elected to do."

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