Footage from Tunisia museum shows gunmen who killed Shifnal mother

The one-minute video posted on the government's Interior Ministry's Facebook page shows the two men calmly walking through the National Bardo museum, carrying assault rifles and bags.

At one point they encounter another man with a backpack walking down a flight of stairs. They briefly acknowledge each other before they walk on in opposite directions. There was no explanation of who the third man was.

One of the attackers is wearing a baseball cap and a heavy jacket, while the other has a red hoodie and tracksuit pants.

Among the 21 dead in Wednesday's attack, 17 were cruise ship tourists, including Sally Adey a solicitor from Caynton near Albrighton.

Mrs Adey was the only Briton to die in the massacre at the Bardo Museum in Tunis. She was gunned down while sightseeing with her husband Rob, 52, also a solicitor with a Birmingham law firm.

The couple were halfway through a dream Mediterranean cruise holiday.

Mr Adey escaped unharmed and was supported by the British Consulate in the north African state in the aftermath of the shootings.

The two gunmen were killed in a firefight with security forces.

The video also shows stills of the dead gunmen, including a picture indicating that at least one was wearing an explosive belt.

Meanwhile, Tunisia's president said today a third attacker is still "on the run".

In a live TV interview with French media Tunisia's President Beji Caid Essebsi said: "There were certainly three attackers... there is one who is on the run, he won't get far."

Suspects have been arrested over the attack but just two gunmen were thought to have assaulted the museum.

Mr Essebsi said it was clear there had been three attackers, because they had "been identified and filmed on surveillance cameras".

He added that a monument would be erected in memory of the victims.

The Islamic State group based in Iraq and Syria has claimed the attack. Several well-armed groups in Libya have pledged allegiance to IS.

Police in Tunisia have arrested five people described as directly tied to the two gunmen. Four others said to be supporters of the cell were also arrested in central Tunisia, not far from where a group claiming allegiance to al Qaida's North African branch has been active.

IS issued a statement and audio on jihadi websites applauding the dead gunmen as "knights" for their "blessed invasion of one of the dens of infidels and vice in Muslim Tunisia".

Several well-armed groups in neighbouring and chaotic Libya had already pledged their allegiance to IS.