Boys attacked by man in separate incidents

A man has allegedly grabbed a 10-year-old boy outside a western Sydney school in one of two attacks on children in as many days.

The 41-year-old man was held down by parents until police arrived after the assault on the young boy outside the gates of a Colyton primary school just after 3pm on Thursday, police allege.

He allegedly assaulted and tried to rob a 15-year-old boy on Shepherd Road at Colyton on Tuesday.

The man has been charged with a range of offences, including assault occasioning actual bodily harm, attempted robbery, intimidation and breach of bail.

He's due to face Penrith Local Court on Friday.