Bangladeshi border guards are stepping up security to stop thousands of ethnic Rohingya refugees streaming into the country from Myanmar.

The United Nations says more than 27,000 Muslims belonging to the ethnic minority group have crossed the border in a week.

The Rohingya, witnesses and international rights groups say the persecuted minority is being targeted in a security crackdown.

Al Jazeera's Florence Looi reports.

Asia, Bangladesh, War & Conflict