Thailand's government says it will install more surveillance cameras nationwide and better lighting in major tourist areas after the murders of two British tourists on a resort island.

Additional police and soldiers were being sent to help the murder investigation on Koh Tao, where Hannah Witheridge, 23, and David Miller, 24, were found battered to death on a beach last week.

Deputy Prime Minister Gen. Prawit Wongsuwan told reporters Thursday he has ordered the Interior Ministry, Bangkok's city government and police to install the surveillance cameras and improve lighting. He said authorities are urgently investigating the case, which critics charge has been bungled by police.