Children have taken part in grizzly executions of prisoners in Iraq and Syria

will need to be de-radicalized after liberation

An Islamic State smartphone app allows its users to carry out 9/11 style terror attacks on Western landmarks such as Big Ben.

The app, which aims to indoctrinate young children living in ISIS strongholds in Syria and Iraq as jihadists, also teaches youngsters to spell out words such as grenade and rocket, according to Col John Dorrian the spokesman for the international coalition fighting the militants.

In addition, the disturbing app, named Huroof or alphabet, was recently updated so users can destroy the Statue of Liberty and the Eiffel Tower.

An Islamic State smartphone app allows its users to carry out 9/11 style terror attacks on Western landmarks

Big Ben in London, Paris' Eiffel Tower and New York's Statue of Liberty can be destroyed dependent on points acquired by the player

Col Dorrian went onto say the children from areas run by ISIS may need to be de-radicalized after they have been liberated due to the indoctrination they have been subject to.

Col Dorrian said: 'The reward for learning something in this app is to get points that they can use to select the terrorism target of their choice.

'Western landmarks that the child can choose and attack using a variety of weapons, including commercial airliners.'

The Android app, called Huroof - meaning alphabet or letters - was released by the ISIS propaganda department the Library of Zeal

The terror faction has released numerous videos of young boys taking part in the executions of prisoners in cold blood

The terror faction has released numerous videos of young boys taking part in the executions of prisoners in cold blood and learning how to use weapons.

And Col Dorrian said 'tremendous damage' was being done to them.

He added: 'I am concerned about is the damage, the numbing of these children who are being taught an ideology from a time that they are very young.