US Tightens Student Visa Rules After Boston Bombing
The US is tightening its screening of international students, its first security change in response to the Boston Marathon bombings last month.
The move comes after a student from Kazakhstan - who did not have a valid visa - was accused by police of hiding evidence for one of the bomb suspects.
The Department of Homeland Security has ordered border agents to automatically check the visa status of every student.
Azamat Tazhayakov had returned to the US despite being dismissed from school.
The 19-year-old appeared in court on Wednesday, accused of helping to throw out a backpack belonging to his friend, Boston bombing suspect Dzhokhar Tsarnaev.