Moment ISIS gunman is seen sprinting across Tunisian beach after killing 38 tourists

Seifeddine Rezgui was spotted by a tourist following his 25-minute rampage where he targeted holidaymakers lounging on the beach in Sousse.

The 55-second clip shows the 23-year-old ISIS militant, who was also carrying grenades, dressed in black and running along the edge of the sea.

It emerged as the number of Britons feared to have been killed in the attack rose to 30 on Sunday night.  

Earlier in the day the Foreign Secretary warned the death toll would rise 'significantly' as the process of identifying victims continued. On Sunday night multiple sources said the number would rise to at least 30.

The Foreign Office could not confirm the figure when contacted, still officially giving the number of Britons killed as 15. 

It came after haunting footage of Rezgui wandering along the beach with a Kalashnikov in his hand emerged. 

In the footage the killer can be seen still carrying the assault rifle he used in the horrifying attack as he turns to sprint up an alley.

The footage, shot from a nearby balcony, was released after a Tunisian police officer revealed he killed the assassin using 'two bullets'.

The policeman, who wished to keep his identity secret, said he spotted the gunman while he was praying in a side street before he shot him twice.

Following his killing spree, Rezgui stopped outside a housing development belonging to Mayel Moncef, 56. 

As bullets rained down on the gunman from rooftop snipers, he dropped to his knees in prayer, allowing a grenade to roll from his hand and into the gutter.

Mr Moncef then picked up a stack of terracotta roof tiles and threw it on the head of the gunman, causing him to stumble. He walked a few yards before the policeman shot him dead. 

'I put two bullets in him. I haven't slept since', he told the Sunday People. 

Witness accounts say Rezgui was seen laughing and joking among the midday bathers, looking like any other tourist.

But he was actually carefully picking out the victims he would murder with a Kalashnikov hidden in his parasol.

In the murderous rampage on the crowded Tunisian beachfront at El Kantaoui near Sousse, he killed 38 - with 36 seriously wounded. 

The British were his prime targets and at least 15 have been confirmed dead with the death toll expected to double. 

'One minute you're on a sun lounger then the next there are bullets whizzing past your head', one witness said. 

(dailymail.co.uk)