Heavy fighting has been raging in the town of Myawaddy on Myanmar’s border with Thailand since Tuesday evening following an attack on military strongholds by an alliance of rebel forces, according to local media and eyewitnesses. A revolutionary alliance led by the Karen National Union’s armed wing, the Karen National Liberation Army (KNLA), had already inflicted heavy losses on the military in the area at the end of last week, and they now seem to have launched new attacks on army positions. “Karen rebels and its alliance forces entered the city and took control of all the major government of…