Four monkeys who escaped from cages at Hillsboro's Oregon National Primate Research Center remained on the loose Saturday morning.

Workers were cleaning the monkeys' cages at the lab, in east Hillsboro near 185th Avenue and Walker Road, on Friday afternoon when the animals escaped. Around 6:30 p.m. Friday, the monkeys were seen near the Willow Creek Transit Center, which has a park and ride lot, MAX station and several bus stops.

According to a release from Oregon Health and Science University, which operates the lab, the animals pose little threat to humans but could bite if they feel threatened. "The animals have not been tested to determine if they carry diseases that are low risk to them but higher risk to humans," the release said.

If you see a monkey, OHSU asks you to call OHSU public safety at 503-494-7744.

For more on this story, see Tuesday's Argus.