BBC News US & Canada

4 May 2013 Last updated at 02:10 GMT

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.
No second check

Mr Tazhayakov's student visa had been terminated by the time he arrived in New 
York on 20 January, following his academic dismissal from the University of 
Massachusetts-Dartmouth on 4 January.

The Department of Homeland Security will "effective immediately" verify that 
every international student visa is valid, according to an internal memo 
obtained by the Associated Press news agency on Friday.

Under the new procedures, border agents will verify a student's visa status 
before the person arrives in the US, using information provided in flight 
manifests.

If that information is unavailable, they will manually check the visa status 
through a US database.

Beforehand, border agents would only verify a student's status in a database, 
the Student and Exchange Visitor Information System, when the person was 
referred to a second officer for additional inspection or questioning.

Mr Tazhayakov was not sent to a second officer when he arrived, because there 
was no information to indicate he was a national security threat, said Peter 
Boogaard, a spokesman for the Department of Homeland Security.

Mr Tazhayakov is not implicated in the planning of the attacks, but he and 
fellow 19-year-old Kazakh, Dias Kadyrbayev, face up to five years in prison if 
convicted of obstructing the FBI investigation.

According to police, Mr Tazhayakov and Mr Kadyrbayev removed items from 
Dzhokhar Tsarnaev's dormitory room at the University of Massachusetts - 
Dartmouth, three days after the blasts, including a backpack filled with 
fireworks remains.
'Blunt trauma'

Mr Tsarnaev, 19, sustained gunshot wounds during the police manhunt days after 
the bombings, and remains in a prison hospital. He faces a possible death 
sentence if convicted.

Three people died and more than 260 were wounded after two explosive devices 
made from pressure cookers detonated near the Boston Marathon finish line on 15 
April.

On Friday, a Massachusetts funeral director said the main suspect's older 
brother, Tamerlan Tsarnaev, had died from gunshot wounds and blunt trauma to 
his head and torso.

The 26-year-old was killed several days after the bombing following a shootout 
with police, when he was run over by his younger brother as he fled the scene 
in a vehicle, authorities have already said.

His body was initially taken to another funeral home, where it was greeted by 
about 20 protesters on Thursday night.
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