A Croydon MP has urged the Prime Minister to take "further action" to fight knife crime after the four-day-old baby of a murdered pregnant mother died this morning.

Baby 'Riley' was delivered by paramedics on Saturday, after his mother Kelly Mary Fauvrelle, 26, was found with fatal stab wounds at an address in Thornton Heath.

Steve Reed, MP for Croydon North, challenged Theresa May directly in Parliament this afternoon, asking her to account for the Government's strategy for dealing with knife crime.

Your Local Guardian: Kelly Mary Fauvrelle

Mr Reed said: "The whole country has been shocked by the brutal murder of a pregnant mum Kelly Fauvrelle in my constituency at the weekend and the subsequent death of her baby Riley announced this morning.

"If the Government has been acting on knife crime it isn’t working.

"So what further action will the prime minister now take to stop the terrifying increase in the use of knives on our streets."

Mrs May responded by stressing the need for a "multifaceted approach," involving society as a whole rather than just the strengthening of police powers.

"We are taking action in a number of ways," she said.

"We will continue to work and work with the Mayor of London on the actions that can be taken across London on this issue, but this is something that requires a multifaceted approach.

"It about the whole of society.

"We we look at giving the police the right powers, we have done that, but we also need to look at how we can ensure that young people particularly do not feel the need to carry knives and that we deal with the criminal drugs that are often behind theses terrible acts of violence."

News of the baby's death came as the Met released footage of a man seen running away from the house along Raymead Avenue, away from Kelly’s address, toward Colliers Water Lane, shortly before police were called.

Mr Reed said that police believe the murder may have been a random attack, committed by someone unknown to the family.

Detective Chief Inspector Mick Norman, who is leading the investigation, mentioned earlier today that police were aware of "speculation about whether Kelly's attacker was known to her" but said detectives were "not in a position to say and we must retain an open mind".

DCI Norman continues to appeal for any witnesses, CCTV or footage or anyone with any information at all that could assist, to come forward.

He said: “Members of the public may have useful information, and I am today reiterating my appeal for anyone who may know anything that will assist the investigation to make contact as soon as possible.”

Anyone with any information should contact police on the dedicated incident room number of 020 8721 4005, or ring 101 quoting CAD 1358/29 Jun.

Alternatively, to remain anonymous, call Crimestoppers on 0800 555 111.