Police said a car struck and killed the cyclists - a man and a woman - before the driver fled the scene of the crash in Bristol.
Crowds flocked to Bristol this weekend for the See No Evil festival - a showcase of work by more than 40 graffiti artists.
The sky above Bristol was filled with hot air balloons this morning ahead of the Bristol International Balloon Fiesta
Avon and Somerset police have confirmed that an officers tried to stop the car just before it collided with two cyclists. A statement on their website said:
– Avon and Somerset police statement
Shortly before 4pm yesterday (Sunday January 27), a police officer's attention was drawn to a Citroen Picasso travelling along Lower Hanham Road at speed.
The officer indicated to the car to stop but it made off. The officer began to follow the car but it was lost to sight almost immediately.
Very shortly afterwards the car stuck another vehicle and then collided with two cyclists on a tandem bicycle.
Two cyclists who were killed in an alleged hit-and-run were named today by Avon and Somerset Police as Ross Simons, 34, and his wife Clare Simons, 30.
The car involved had ignored a police request to stop prior to the crash.
Residents of the predominately residential street in Hanham, Bristol, where two cyclists died this afternoon have spoken of their shock at the hit-and-run.
Beauty therapist Andrea Swerley, 28, lives next to the police cordon: "We got home and saw a helicopter in the air overhead and looking up the road, which they were just closing, we could see lots of police. It's just a shock, nothing like this has happened here before."
Landlord of The Queens Head, Patrick Murphy, added: "It's just not nice that this has happened around here."
A 38-year-old man has been arrested after handing himself into police.
A 38-year-old man has been arrested after handing himself into police following a hit and run accident in which two cyclists were killed.
A man and a woman were struck and killed before the driver of a Citroen car fled the scene in Hanham, near Bristol.
Police were called to Lower Hanham Road shortly after 3.50pm.
Police are appealing for witnesses after two cyclists were killed in an apparent hit and run incident in Hanham, Bristol.
"A 38-year-old man who left the scene of the collision has handed himself in at a police station and has been arrested on suspicion of death by dangerous driving," police said.
Witnesses in the Bristol area are asked to call 101 with any information.
A 38-year-old man has been arrested after handing himself in to police following a hit and run in which two cyclists were killed, Avon and Somerset police said.
A woman who lives on Bristol's lower Hanham Road, where the scene of today's fatal collision took place, compared the road to a racetrack.
"It is a bit of a racetrack down here and there have been several accidents over the years," Margaret Leonard, 62, told thisisBristol. "This is a real tragedy and it has shocked the whole village."
Another resident, who would only give his name as James, said: "It is a busy road and something should be done to slow people down."
The man and woman killed this afternoon in what is believed to be a hit-and-run incident in Hanham, Bristol, were a couple on a new tandem bicycle, according to This is Bristol.
The driver of a car that hit and killed two cyclists in Hanham, Bristol, left the scene.
Police know who they are looking for.