Olathe police temporarily closed Kansas 7 at Santa Fe Road on Monday during rush hour as they searched for a suspect in an assault.
Officers had been called to the area of East Johnston and North Walker streets about 3:40 p.m. after a person reported being threatened with a weapon.
The suspects left the scene before officers arrived, and police later located a suspect vehicle near Kansas 7 and Harold Street. They arrested one person there and conducted an extensive search of the area for a second suspect.
As part of that search, police closed Kansas 7 to traffic. Helicopters circled the area.
Police later opened the road to traffic again. The second suspect has not been found, police said late Monday night.