On Sunday night, there were unconfirmed reports that some hostages had been executed after attempts by the military to launch an assault on the roof.
Some claimed hostages were ‘shot and thrown out of the window' of the building's fourth floor.
Other attackers identified on the Twitter account were from Finland, Kenya, Somalia, Canada and America.
Last night, Al Shabaab spokesman Mukhtaar Robow told Channel 4: ‘The English know Somalis will not give up the fight.'
Prime Minister David Cameron described the assault as ‘absolutely sickening'.