Counter-terror chiefs have taken steps to prevent a banned organisation - which once praised the 9/11 attacks - circumvent the law by changing its name.

Alternative names for proscribed organisation Al-Muhajiroun, which once held a conference called The Magnificent 19 to praise the terrorists who attacked the Twin Towers in New York in 2001, have been covered by a new banning order.

More recently, it emerged Michael Adebolajo, the man convicted of murdering Fusilier Lee Rigby in a broad daylight attack in Woolwich, attended Al-Muhajiroun meetings and demonstrations.

Need4Khilafah, The Shariah Project and The Islamic Dawah Association are now banned as aliases for the group, which is also known under already-banned names Al Ghurabaa and The Saved Sect.

Islam4UK, which was led by radical preacher Anjem Choudary, is also covered by the order.

Immigration and Security Minister James Brokenshire said: "Terrorist organisations should not be allowed to escape proscription simply by acting under a different name.

"That is why we have today laid an order which will, from tomorrow, recognise the Need4Khilafah, the Shariah Project and the Islamic Dawah Association as aliases of the group already proscribed as both Al Ghurabaa and The Saved Sect.

"The group is also known as Al Muhajiroun. This means being a member of or supporting the organisation is a criminal offence.

"Al Muhajiroun remains of significant concern to the UK and the international community, and this order will ensure that that it cannot operate in the UK as Need4Khilafah, the Shariah Project and the Islamic Dawah Association."

The effect of this Order is that being a member of or supporting any group operating under these names will be a criminal offence as to do so will amount to being a member of or supporting the group contrary to sections 11 and 12 of the Terrorism Act.