Police investigating the murders of Hannah Witheridge and David Miller on the Thai island of Koh Tao have released a CCTV image of a man that they consider to be a "prime suspect."
Miss Witheridge, from Great Yarmouth, and Mr Miller were found with significant head injuries earlier this week.
Officers say that the man looks asian and could be a migrant worker, but added that they are following a number of leads in the case.
"We are focusing on migrant workers because of the surrounding witnesses and evidence, including the video footage.
We are sweeping hotels, bars, businesses and residences of migrant workers on the beach to find the suspect."
Staff from the University of East Anglia say that they are "extremely saddened" by the death of 23-year-old Hannah Witheridge, after she was murdered while holidaying on the Thai island of Koh Tao.
Miss Witheridge, from Great Yarmouth, was a graduate from the university and completed a three year BA in Education in 2012.
She was killed along with David Miller from Jersey earlier this week.
The UEA have announced that the university flag will be lowered in Hannah’s memory on 17 September.
“Hannah excelled in her studies. She was a very dedicated and highly motivated student.
For her dissertation she carried out a study on the importance of outdoor learning in the early years and this was one of the best in the year.
Outside the University Hannah was a very keen equestrian and enjoyed being out and about with her friends. She was an exceptional young woman, much loved both by her fellow students and by her tutors. She was very supportive of her friends and in turn she created very close knit friendships with her peers.”
Police officers in Thailand are questioning three migrant workers from Burma over the killing of two British tourists on the resort island of Koh Tao, ITV News understands.
Police have released still images from CCTV cameras in the area, one of which shows what police said were the two victims walking together hand-in-hand.
They said a man pictured in a later image, who looked Asian, was considered a prime suspect, but they added they are still following a number of leads in the case.
A British woman killed in Thailand has been identified as Hannah Witheridge, by Thai authorities.
The 23-year-old from Great Yarmouth was murdered last night with David Miller from Jersey on the island Koh Tao.
The pair were attacked on their way back to their hotel after leaving a beach party together.
The bodies of two British tourists found on a beach on the popular Thai island of Koh Tao were discovered with "gruesome" head wounds, police have said,
Colonel Prachum Ruangthong said the man and woman were found on a rocky beach and their clothes and a bloodstained hoe were found nearby.
Police suspect the pair were killed with the hoe, leaving deep wounds on their heads.
Mr Prachum also said police are checking closed circuit TV footage at nearby restaurants, hotels and shops for clues.
The British man and woman killed in Thailand did not know each other before the night they were killed, ITV News understands.
It is believed the pair were staying at the same accommodation, but only met at a beach party last night.
They were attacked and killed after they left the party on Koh Toa.
Police in Thailand are wanting to interview a British man in connection with the murder of two British tourists on the holiday island of Koh Tao, ITV News understands.
Police believe that the man may be a friend of one of the murdered Brits and it is thought he left the island by an early ferry and is heading for Bangkok.
A British woman found dead in Thailand checked into a hotel with friends three days earlier, ITV News understands.
Staff at Ocean View bungalows said the female victim arrived with three other women.
The male victim she was found with was staying in a different room at the resort, they added.
Police were at the hotel earlier but have now left.
Two British tourists found murdered on a beach on the Thai island of Koh Tao could have been targeted by robbers as they left an open air party, according to local media.
The bodies of a 23-year-old woman and 24-year-old man, from Great Yarmouth and Jersey respectively, were found 100 metres away from the scene of a beach party.
The Foreign Office is seeking more information from Thai authorities after two British tourists were murdered on the island of Koh Tao.
In a statement, the Foreign Office said:
We are aware of the death of two British nationals on September 15 on the island of Koh Tao in the Gulf of Thailand.
The embassy are urgently seeking information from the local authorities and consular staff stand ready to provide assistance to friends and family at this tragic time.