Police are urging people to be vigilant after a series of suspicious incidents involving men approaching children in the Deepings.
An 11-year-old girl was approached by a man driving a van in Thackers Way, Market Deeping, at about 4.30pm on Wednesday.
The man, who is described as being of muscular build with a white baseball cap on, tried to entice her into his vehicle.
Two men in a white van approached a 12-year-old boy and tried to entice him into their vehicle in Millfield Road, Market Deeping, at about 3.10pm yesterday (Thursday).
On the same day a 15-year-old girl felt that she was being followed by a man in the Burchall Close area of Deeping St James.
All the children returned safely to their homes and told their parents.
Officers are urging parents not to panic, but to be vigilant and to give their children the usual common sense stranger danger advice.
Investigations are progressing and extra resources have been deployed to the area to at key times to step up patrols.
Anyone with any information should call Insp Mike Burnett via the 101 number.