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A third cyclist has been killed on the streets of London in the space of just four days.

The rider, a man aged in his early 30s, died after a collision with a lorry in east London's Docklands at about 1.30pm on Thursday, police said.

Emergency services raced to the crash on North Woolwich Road at about 1.30pm on Thursday.

Paramedics fought to save him but he was pronounced dead at the scene.

Scotland Yard said the lorry driver stopped at the scene and has not been arrested.

The crash comes after architect Karla Roman was killed in a crash with a coach on a cycle superhighway in Whitechapel at rush hour on Monday morning.

The 32-year-old had moved to London from Brazil in 2012 and was cycling to her job at award-winning LOM Architecture and Design in Shoreditch at the time of the crash.

Hours earlier, newlywed Anita Szucs, 30, died after a suspected hit and run crash in Edmonton at about 1.45am on Monday.

Mrs Szucs, who moved to the capital from from Hungary several years ago, was returning from a late shift at a warehouse in Edmonton when she was knocked down in Bounces Road, near her Enfield home.

Witnesses to the crash in Docklands on Thursday reported seeing a swarm of emergency services in the area.

Steve Hunnisett, who was travelling on the DLR at the time told the Standard: “I could see lots of blue lights and a bus with a white tarpaulin erected in front of it. It looked bad. I could see a couple of fire engines and paramedics on scene."

Richie Champan said he could hear sirens and became stuck in traffic.

He posted on Twitter: “Accident on silvetown way just before BP garage. Queues building fast.”

And Dean Warrington wrote on Facebook: “Major collision on North Woolwich Road no access from Silvertown way.”

Campaigners from the London Cycling Campaign have called on the Mayor of London to prioritise improving infrastructure for pedestrians and cyclists after the fatal crashes.

Activists want Mr Khan to ensure junctions frequently used by those walking and cycling are safe.

A spokesman said: “Too many people die in collisions with motor vehicles when cycling or walking on London’s streets and our thoughts are with the bereaved.

“Urgently accelerating programmes to make cycling and walking safer are the only solution. We look to the Mayor, the boroughs and TfL to ensure such tragedies are a thing of the past so that everyone, whatever their age or ability, feels able to walk and cycle safely.”

Campaign group Stop Killing Cyclists are planning a huge gathering to pay tribute to the women outside the Treasury on Horseguards Parade on Saturday.

The die-in vigil will coincide with a protest demanding that the Chancellor Philip Hammond increases investment in the UK’s cycling and pedestrian infrastructure to 10 per cent of the transport budget.

A Met Police spokesman said: "Police were called by London Ambulance Service at approximately 1.30pm on Thursday, February 9 to reports of a cyclist in collision with a lorry in Knights Road, E16.

"Officers and London Ambulance Service attended and found a male cyclist suffering from critical injuries following a collision with a lorry.

"The cyclist, a man in his early 30s, was pronounced dead at the scene. Enquiries are underway to locate next of kin.

"The driver of the lorry stopped at the scene. There are road closures and diversions in place. Motorists are advised to avoid the area.

"Officers from the Met's Roads Transport Policing Command are investigating.

"No arrests have been made. Enquiries continue."

A London Ambulance Service spokesperson said: "We were called at 1.24pm today to reports of a road traffic collision at Knights Road, E16.

"We sent an ambulance crew, an incident response officer, a single responder in a car and an Hazardous Area Response Team (HART) to the scene. The first of our medics arrived at the scene in under seven minutes.

"Sadly, despite the best efforts of our crews, a patient died at the scene."

Leon Daniels, TfL’s Managing Director of Surface Transport, said: “Our thoughts are with the families and friends of those who have tragically lost their lives on London’s roads this week.

“Any death or serious injury on our roads is one too many, and our priority is to eradicate them.

"We’re investing in safer cycle lanes and junctions, working with London boroughs to introduce more 20mph limits, looking to remove the most dangerous Heavy Goods Vehicles from the Capital’s roads by 2020 and continuing our road safety education and enforcement programmes.”

Anyone with information is asked to call police on 101 or Crimestoppers anonymously on 0800 555 111. You can also tweet @MetCC.