Updated 11:30am

A school in north Co Dublin is closed today after online threats were allegedly made against staff and students.

A 16-year-old boy had been arrested by gardaí investigating the incident.

The material is believed to have been circulated online yesterday evening.

Gun-related threats were allegedly made against staff and students at Ardgillan College in Balbriggan.

It is understood school management notified parents via text message last night that the school would not be opening today.

Gardaí say they are liaising with management at the school.

However, they are also satisfied that there is no imminent danger to staff or students at the school.

In a statement, they said: "Following the reports [of threats], an investigation was commenced and a 16-year-old youth has since been arrested.

"He is currently detained under Section 4 of the Criminal Justice Act, 1984 at a Dublin Garda Station."