Kids as young as 14 are putting lives at risk by hurling rocks at buses packed with passengers.

The teenage tearaways have targeted a number of McGill’s vehicles ferrying people around Johnstone, causing thousands of pounds worth of damage.

In response, police – who fear someone could be killed if the mindless attacks continue – are stepping up patrols.

Sergeant Alan Mack, who is based in Johnstone, told The Gazette: “Over the last two weeks, there have been four separate reports of youths throwing stones at buses from woods near Beith Road.

“They are actively targeting these buses and this is incredibly dangerous. It is causing mayhem and can potentially cause death.

“We are stepping up patrols to try to catch those responsible.”

It is believed the yobs responsible for the attacks could be making their way to and from Johnstone High School.

Sergeant Mack added: “We have zero tolerance for this and the entire group will be punished when we catch whoever is responsible.

“This can have horrendous consequences and is extremely reckless.

“We will be going into Johnstone High School to make it clear how deadly these actions can be.”

A McGill’s spokeswoman said: “In recent weeks, we have had a number of brutal attacks on our buses.

“The attacks could have resulted in serious injuries, not just for those travelling on our buses but for anyone on the road, not to mention the thousands of pounds worth of damage to our vehicles and the stress and worry caused to our staff and customers.

“Every effort will be made to minimise disruption to customers as a result of the criminal and dangerous actions of those involved but, if it continues, we will need to re-think the McGill’s service to these areas.”

A Renfrewshire Council spokesman said school pupils are reminded of the “appropriate behaviour” expected of them, both in and out of the classroom.

He added: “We take any reports of anti-social behaviour seriously and will fully investigate any incidents reported to us.

“We will continue to work closely with our colleagues in the police to provide the appropriate messaging to reduce this type of behaviour and ensure our pupils are aware of the consequences that irresponsible actions can have.”