(Photo: Piyarat Chongcharoen)KANCHANABURI: Security has been tightened along the border in Sangkhla Buri district as fresh fighting erupted in Myanmar on Saturday morning. They are about 200 metres away from the Three Pagodas Pass in Sangkhla Buri. People were not allowed to pass through the Nam Kerd security checkpoint in Nong Lu for their own safety. But security officers will remain on full alert along the border around the clock, particularly in vulnerable areas, to prevent possible intrusions. Sutthiporn Siwawetphikul, the Sangkhla Buri district chief, on Saturday assigned his deputy Damrongrat Suphaphan to inspect the border area and monitor the situation.