A yob smashed a car window while a six-week-old baby - and two other children - were inside.
The blue Renault Scenic was travelling along the Barton Road Swing Bridge over the Manchester Ship Canal on Sunday afternoon when an object was hurled at it.
The rear window was smashed in the incident at around 3pm.
A six-week-old baby boy and two teenage girls, aged 13 and 14, were in the backseat.
The children were not injured.
Their dad, who asked not to be named, said a group of young children were seen running away after the window was smashed.
The 36-year-old said: “As we were driving over the bridge we heard a loud thud and the rear windscreen just shattered.
“I immediately pulled over just as we got over the bridge it was raining quite hard my kids were screaming in the back.”
He added: “I’ve seen recently on the news about taxis getting hit by stones and bricks.
“It’s so dangerous and I couldn’t begin to imagine what would gave happened if it was my front windscreen and not the back.”
A spokeswoman for Greater Manchester Police said: “We were called at 3.20pm on January 21. It happened at 2.55pm.
“We were called to reports a rear window was smashed. The person was driving on Barton Bridge.
“He was driving and heard his rear window smash. There were children in the back of the car.”
It comes after taxi drivers reported young thugs were hurling bottles and stones at their cars in Oldham.
Taxis have been pelted with bricks, stones and bottles in several incidents in Failsworth over the past few months.
Witnesses - or anyone with information - is asked to call police on 101, or Crimestoppers, anonymously on 0800 555 111.
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