Thai soldiers take cover as they react to explosions and sounds of gunfire at the Thai border with Myanmar in Mae Sot November 8, 2010. A clash erupted between ethnic minority Karen rebels and government soldiers in Myanmar's Myawaddy town opposite the Thai border town of Mae Sot, Reuters witnesses on the Thai side of the border said. Several rockets or mortar bombs fell on the Thai side, a witness said. There were no reports of casualties. REUTERS/Chaiwat Subprasom

A Thai soldier and a migrant worker from Myanmar take cover as they react to explosions and sounds of gunfire at the Thai border with Myanmar in Mae Sot November 8, 2010. A clash erupted between ethnic minority Karen rebels and government soldiers in Myanmar's Myawaddy town opposite the Thai border town of Mae Sot, Reuters witnesses on the Thai side of the border said. Several rockets or mortar bombs fell on the Thai side, a witness said. There were no reports of casualties. REUTERS/Chaiwat Subprasom 

A woman with Thanaka paste on her face rests after crossing over from Myanmar when a battle erupted between Myanmar's soldiers and rebels, at the Thai border town of Mae Sot November 8, 2010. A clash erupted between ethnic minority Karen rebels and government soldiers in Myanmar's Myawaddy town opposite the Thai border town of Mae Sot, Reuters witnesses on the Thai side of the border said. Several rockets or mortar bombs fell on the Thai side, a witness said. There were no reports of casualties. REUTERS/Chaiwat Subprasom 

A Thai police stands guard over a group of people, who crossed over from Myanmar when a battle erupted between Myanmar's soldiers and rebels, at the Thai border town of Mae Sot November 8, 2010. A clash erupted between ethnic minority Karen rebels and government soldiers in Myanmar's Myawaddy town opposite the Thai border town of Mae Sot, Reuters witnesses on the Thai side of the border said. Several rockets or mortar bombs fell on the Thai side, a witness said. There were no reports of casualties. REUTERS/Chaiwat Subprasom

A woman holds her child after crossing over from Myanmar when a battle erupted between Myanmar's soldiers and rebels, at the Thai border town of Mae Sot November 8, 2010. A clash erupted between ethnic minority Karen rebels and government soldiers in Myanmar's Myawaddy town opposite the Thai border town of Mae Sot, Reuters witnesses on the Thai side of the border said. Several rockets or mortar bombs fell on the Thai side, a witness said. There were no reports of casualties. REUTERS/Chaiwat Subprasom