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Police have released shocking footage of the brutal murder of a British tourist during a horror street robbery in San Francisco.

Paul Tam, 44, from Manchester, was stabbed in the head with a knife as he walked through the city with his young niece.

He had been fighting for life in hospital since the horrific attack over a month ago, but died on Thursday.

Eyewitnesses said there had been a scuffle between Mr Lam and one of the robbers as he attempted to hold onto a green bag containing personal belongings.

It contained his passport, money, mobile phone and bank cards. Mr Tam’s niece wasn’t hurt.

San Francisco police have released footage of the shocking stabbing in the hope of tracking down the two robbers.

(Image: San Francisco Police) (Image: San Francisco Police) (Image: San Francisco Police)

Police are now hunting both the man and woman. He’s been described as black, aged in his 30s or 40s, muscular and about 5ft 10ins tall.

The woman, said to be younger, was also black and is described as having dreadlocks or braids in a ponytail. She is said to be about 5ft 4ins.

Mr Tam was understood to have left Manchester to pursue new opportunities in the States.

He worked as a web content and digital marketing manager.

He had worked there in the IT department for around 10 years, according to his LinkedIn profile, before he left at Christmas to work in America on a freelance basis.

It’s understood he has family in the San Francisco area.

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The terrifying attack happened at the junction of Franklin Street and Post Street, near St Mary’s Cathedral, in the Japan town area of central San Francisco.

Police said he had been staying in a hotel in San Francisco at the time and his niece had travelled from southern California to visit him.

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The attack has prompted calls in the area for an increased police presence and extra patrols.