Two reports of a man either following boys or asking them to enter a vehicle have been made to police in the last few weeks in the Horsham district.
The two incidents occurred in Link Lane, Pulborough, on Friday October 17 and in Church Street, West Chiltington, on Wednesday October 8.
Sussex Police are investigating these incidents to establish whether they are linked and whether or not criminal offences have been committed.
The description of a vehicle that has been given is of an older, Land Rover-style green 4x4.
Chief Inspector Howard Hodges, Sussex Police’s Horsham district commander, said: “We are taking these incidents very seriously and are completing a number of lines of enquiry to investigate these matters fully to identify the male and vehicle concerned and to provide support to those involved.
“At this stage I would like to provide reassurance to the wider public of Horsham that we are taking these matters seriously and working with partners - including local schools - to understand them fully. There have been no further reports for more than two weeks but we will not be complacent.
“There is no cause for alarm at this stage and I would like to ask the public to be vigilant and to report any concerns that they may have - or previously unreported incidents - to Sussex Police either via 101, 999 in an emergency, online via the Sussex Police website or confidentially via Crimestoppers if preferred on 0800 555111 quoting Operation Block.”