BANGKOK: More than 5,300 people are still trapped in online scam centres near Myanmar's Thai border, a human rights group said, over one year after thousands were freed during a multinational crackdown in the region.    In a letter to Thai police on Monday (Jun 22), urging them to take action, the Civil Society Network for Human Trafficking Victim Assistance (CSNHTV) said many of those trapped were foreign nationals held at four locations inside areas controlled by a Myanmar militia. The group