Phnom Penh, Aug 18 (IANS): Cambodia has tightened security after a bomb exploded in Bangkok, Thailand on Monday, killing over 25 people, national police spokesman Lieutenant General Kirt Chantharith said on Tuesday.

"I made a statement to all municipal and provincial police chiefs to beef up security and pay attention to collecting information related to security," Xinhua quoted Chantharith as saying.

Ang Kim Eang, president of the Cambodia Association of Travel Agents, said tightening security is essential to make tourists feel safe in Cambodia.

"I do not think the blast in Bangkok will affect tourism in Cambodia, but it is necessary to enhance security to make tourists feel safe in Cambodia," he said.

Police discovered an explosive device early on Tuesday near Angkor world heritage site in Cambodia's Siem Reap province, said Chantharith.

"We have CMAC (Cambodian Mine Action Centre) to inspect it, it is an unused bomb, maybe, someone threw it away or accidentally dropped it," he said, adding that an investigation is underway.

"However, we can conclude that it is not an attempt to explode the bomb," he said.