Karen refugees flee Myanmar crackdown

In just under two weeks' time, the people of military-ruled Myanmar will vote on a new constitution.

But there is little expectation the result will help end six decades of internal warfare between the regime and minority ethnic groups.

Fighting, human rights abuses and economic hardship have seen two million people flee to neighbouring Thailand.

But as Paul Allen explains in this secretly filmed report, thousands more are on the run inside Myanmar's borders.