A fourth man has been charged with a terror offences following a investigation into an alleged threat to kill Prime Minister Gordon Brown, police said.
Muhammad Ali Mumtaz Ahmad, 24, of Whalley Range, Blackburn is charged with possession of an article in circumstances which give rise to a reasonable suspicion that his possession is for a purpose connected with the commission, preparation or instigation of an act of terrorism contrary to Section 57 of the Terrorism Act 2000.
He will appear before Westminster Magistrates in London, Lancashire Police said.
Lancashire Police said Ahmad is jointly charged with brothers Abbas and Ilyas Iqbal.
Ilyas Iqbal, 21, is accused of owning terrorist material and conducting research into terror.
Abbas Iqbal, 23, and Ishaq Kanmi, 22, are accused of spreading terrorist literature.
The three men, who are also from Blackburn, appeared before Westminster Magistrates last Friday and were remanded in custody.
Ilyas Iqbal will appear before magistrates on Friday by videolink and again on September 19.
Kanmi and Abbas Iqbal will appear again at the Old Bailey on October 1.
Greater Manchester Police were granted a warrant for further detention to question a 29-year-old man arrested on August 26 in Derby.
