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Police investigating the murder of a Brit in a San Francisco street robbery have released sketches of two suspected attackers.

Paul Tam, 44, was knocked to the ground and stabbed as he tried to flee the assailants who pounced as he walked with his niece near the city's cathedral on the evening of February 18.

Murder detectives released CCTV footage of the attack in the Japantown neighbourhood of the Californian city, which showed Mr Tam being chased into the street before being knifed.

The website manager, who worked for Manchester University, was taken for treatment at San Francisco General Hospital where he died on March 24.

(Image: LinkedIn)

The robbers took Mr Tam's bag which reportedly contained his passport, money, mobile phone and bank cards.

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On Monday police issued sketches of a man and a woman wanted in connection with the deadly mugging and a £3,500 reward for information leading to their arrest.

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A San Francisco Police Department spokesman said: "On Thursday, February 18 2016 at approximately 8.30pm, two victims were attacked during a street robbery on Post Street, between Franklin and Gough Street.

(Image: San Francisco Police)

"During the course of the robbery one of the victims was attacked with a weapon. The two robbery suspects fled on foot.

"On Thursday, March 24 2016, the victim who had been attacked with a weapon succumbed to his wounds and died.

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"The victim was a 44-year-old man who was a tourist from the United Kingdom.

"Video evidence was recovered that captured the brutal murder and composite sketches of the suspects have been drawn."

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

The suspects were described as a "black adult male approximately 5ft 10in with a heavy build who last seen wearing a dark hoodie and blue jeans" and a "black/mixed race adult female approximately 5ft 4in, small build with dreadlocks or braids".

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A spokeswoman for the Foreign & Commonwealth Office said previously: "We can confirm the death of a British national on March 24 in San Francisco and we are providing consular assistance to the family at this difficult time."