An American tourist has been arrested after allegedly raping a Thai massage worker and sexually assaulting a 13-year-old girl while he was high on drugs.

Robert Andrew Gordon, 37, from Colorado, booked an oil massage before allegedly attacking the woman and raping her at the shop in Khon Kaen province, northeast Thailand, on September 27 morning.

He was seen on CCTV an hour later after the massage had finished suddenly wrapping a towel around the alleged victim's neck and wrestling her to the ground.

Footage then shows him walking around the reception area naked before fleeing on a motorcycle and allegedly molesting the teenage girl, who had been selling honey at a roadside stall.

Shocked locals noticed blood and water coming from the door of the massage parlour before finding the half-naked unconscious woman inside. Her trousers had been removed and she was rushed to hospital with severe head injures before coming round.

Officers began a national manhunt and arrested Gordon 300 miles away in a hotel room in the notorious red-light district Soi Nana in the capital Bangkok. Footage shows the American being pinned to the ground and handcuffed on Saturday October 2.

He allegedly confessed to both attacks but claimed he was high on methamphetamine pills at the time and had no control over his actions. Gordon later reportedly refused to take part in a public reconstruction of the crime.

Officers have charged him with physical assault, rape and illegally detaining others, in connection with the alleged attack on the masseuse and the molestation of a 13-year-old girl.

Deputy national police chief General Damrongsak Kittipraphat said: 'The suspect attacked the massage worker then molested a young girl while he was escaping.

'Officers checked CCTV from the shop and immigration records. With the help of witnesses, we were able to identify the man.'

Police obtained an arrest warrant from the Khon Kaen provincial court before Gordon was arrested in Bangkok, where he had fled on his motorcycle. They said he had arrived as a tourist.

General Damrongsak Kittipraphat added: 'The American man confessed to the attacks and said he was under the influence of drugs at the time. He blamed them for making him feel overly sexual.

'Our team of officers lead the investigation and arrested him at a hotel. We found the same clothes and same motorcycle from the scene of the crime. The suspect confessed and he has been charged according to the law.'

To help identify Gordon, officers interviewed a lorry driver who allegedly witnessed the attack on the teenage girl. They also spoke with Thai women in the area who have foreign husbands as well as checking immigration records and following his tracks on CCTV.

During the investigation, the alleged victim's son said: 'My mother worked abroad and has only returned here recently. She then worked at the massage parlour.'

It was not yet clear whether the woman knew the foreigner as she has not been able to give a full account due to the extent of her injuries.

However, officers said she has regained consciousness and they are coordinating with the doctors to do a thorough physical examination to find the extent of the woman's injures and the alleged assault.