Spencer police are searching for the driver of a white van who tried to make contact with some students at a playground in Spencer.
Police say a man in his 60s stopped at an elementary school Tuesday afternoon and motioned for the students to come over. Some teacher aides came outside and the man left.
Three similar incidents have been reported in Lyon and Dickinson counties in the past few weeks.
Spencer Police Chief Mark Lawson says the suspect and vehicle description in Tuesday's incident are a close match to the others, but he can't say if the cases are linked.