Police say that 52-year-old Hector Castro first approached a 7-year-old boy at the Broadway Mall at 5:20 p.m. on Monday and grabbed his legs inappropriately.
The boy's mother confronted the suspect, and he walked away.
Just a short time later, he's accused of approaching an 11-year-old girl and touching her inappropriately.
He ran from the scene and was spotted by officers nearby.
Castro is now facing two counts of endangering the welfare of a child.
Detectives request if anyone believes they may have been a victim of Castro, to contact Second Squad Detectives at (516) 573-6352.
* More Long Island news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube