Thailand's government says it will install more surveillance cameras nationwide and better lighting in major tourist areas after the murder of Hemsby student Hannah Witheridge.

Miss Witheridge, 23, of the village near Great Yarmouth, and David Miller, 24, of Jersey, were killed on a beach on the island of Koh Tao last week.

Yesterday deputy prime minister General Prawit Wongsuwan said he has now ordered the Interior Ministry, Bangkok's city government and police to install surveillance cameras and improve lighting.

He said authorities are urgently investigating the case, adding that additional police and soldiers are being sent to help the murder investigation.

General Prawit Wongsuwan said: 'The area where the incident happened was very dark. The closed-circuit cameras could not capture images. I have ordered [authorities] nationwide that there must be sufficient lighting, especially in Bangkok and major tourist cities.

'And there must be closed-circuit TV cameras all over the country.

'I'm confident we will see clearer results within two months.'

None of the dozens of DNA samples taken from migrant workers, Thai men and foreigners has matched the crime scene evidence, and no arrests have been made since the bodies were found, and critics say the investigation has been bungled by police.

'Right now we have limited the investigation to some areas and some individuals. We are not getting lost like they said because we have to work systematically,' said Gen Prawit.

Senior police have refused to comment on claims they were 'close to making an arrest' in connection with the murders.

Do you want to pay tribute to Hannah? Email lauren.rogers@archant.co.uk.