Police are investigating “distressing” bomb threats which have been made against schools today.

The threat sparked the closure and evacuation of a girls’ school in Birmingham earlier today but it has since reopened.

The National Crime Agency has launched an investigation but has reassured schools that it does not believe there is a credible threat.

Selly Park Technology College for Girls in Birmingham was evacuated  after it received the threat on email.

E-mails have been reportedly received by schools across the Midlands and in London.

A National Crime Agency spokesman said: “We are aware of a number of threatening emails being sent to schools and are investigating alongside partners.

“We understand that these types of emails can be distressing and while we take the communications extremely cautiously, we must stress there is no credible threat

“We would ask that anyone receiving such an email contact their local police.”

In a statement Selly Park Technology College for Girls said: “After evacuating the premises following a threat received this morning to a number of schools, and following advice from the police, we have reopened the school. The day will finish at 15:05 as normal. Thank you to all our staff, pupils and parents for their calm cooperation.”

It is the latest in a series of widespread bomb threats which have been made against schools.

In March this year schools across the country received a threat that a bomb would be detonated unless they hand over cash.