An al-Shabaab propaganda video aimed at potential recruits in Britain is compelling evidence of a UK link to this growing militant group.
An Al-Shabaab recruitment video makes reference to 10 British militants, raising the possibility of links to the attack on a mall in Kenya.
British investigators are struggling to pierce the secrecy surrounding Kenya's Westgate mall attack.
Radical Islamist Anjem Choudary is reported to have featured in a video that threatened UK Muslims, according to the Daily Telegraph.
Mr Choudary allegedly called David Cameron and Home Secretary Theresa May "pathetic foolish leaders".
The preacher told the newspaper: “I am happy for what I say anywhere in the world in any clip because at the end of the day I believe that I speak what is right according the divine texts.
“If they want to use that clip I don’t have any problem with that at all.”
UK-based imam and broadcaster Ajmal Masroor has written on his Facebook page that two Metropolitan police detectives arrived at his home on Wednesday night to warn he was "in imminent danger from the terrorists."
The police officers were visiting me to give me a warning and asking me to be more vigilant.
As soon as they left my house I started digging further and found an al-Shabab video has been uploaded on the internet and in it they name me as a Muslim who is an enemy of Islam and should be eliminated.
They name a few others in their video message and encourage people to resort to using knives to behead people like me.
Scotland Yard is investigating a video apparently made by Somali militant group al-Shabab after British Muslims who have spoken out against extremism were named as targets.
The hour-long film, narrated by an unidentified man with a British accent, reportedly praises acts of Islamist terrorism and starts by hailing the killing of soldier Lee Rigby in Woolwich, south east London.
The video singles out British Muslim commentator Mohammed Ansar as one of those who "distanced themselves" from those who carried out the attacks and as having "mutilated the teachings of Islam", according to reports.
He is one of a number of prominent Muslims to claim police have issued warnings to following credible evidence of potential threats against them.
Pentagon press secretary George Little has confirmed a counter-terrorism operation "against a known al-Shabaab terrorist" but did not add any further details:
I can confirm that US military personnel were involved in a CT operation yesterday against a known al-Shabaab terrorist.
Somali Islamist militants say "Western" forces attacked a house in one of its coastal bases in the town of Barawe under the cover of dark, killing one rebel fighter.
Foreign forces landed on the beach at Barawe, about 180 km (110 miles) south of Mogadishu, and launched an assault that drew gunfire from rebel fighters, Sheikh Abdiasis Abu Musab, spokesman for al Shabaab's military operations, told Reuters.
It was not immediately clear why the Barawe base had been targeted specifically, nor whether the assault was related to the attack on a Kenyan mall two weeks ago, which the al Qaeda-linked group said it carried out and which killed at least 67.
Western navies patrol the sea off Somalia - mired in conflict for more than two decades - and have in the past launched strikes on land from warships.
No foreign military units typically involved in such operations in Somalia have said they were involved in the strike. One Western official in the region declined to comment.