Onlookers were left disgusted after seeing a couple engaging in sexual activity on the pavement in Swindon town centre.

Police were called to the scene outside Iceland where two women were allegedly undressing each other and performing sexual acts in a 20-minute-long tryst.

One person described them as being so drunk that they did not even notice the policeman who arrived on his bike at the scene in the alleyway by Havelock Car Park.

Various cans and bottles could be seen around the pair during the incident.

Swindon Advertiser: The incident occurred in the alleyway besides the Iceland store in the town centre.The incident occurred in the alleyway besides the Iceland store in the town centre. (Image: Public submission)

A manager for Iceland, who asked to remain anonymous, said it was a shocking incident and had called 999.

“My delivery drivers were loading up the vans and saw two females on the floor undressing each other with their hands down each other’s pants,” he said.

“I called the police at around 3.50pm.”

He added that one of the women on the pavement had her top above her chest in full view of passing members of the public.

Swindon Advertiser:

“Me and my team were disgusted by it. Why would people do that in public on a sunny afternoon like today,” he said.

"People walking past were making comments and one man was with his two young children and was disgusted."

Six police officers arrived at the scene just before 4pm he said.

Swindon Advertiser:

“It went on for about 20 minutes or longer and they were so intoxicated, as they had a bottle of vodka with them, that they did not even notice the first police officer who arrived,” he said.

“One of the females kicked the police car as she was dragged away to the van and it was all over by around 4.10pm.”

The Adver has approached Wiltshire Police for comment.