New Boston suspects linked to Tsarnaev

Two additional suspects arrested for the Boston Marathon bombings are US students from Khazakstan.

A screen grab image from CCTV footage released by the FBI of the Boston Marathon bombing suspects. Picture:

NEW YORK - Officials on Wednesday confirmed two of the three additional suspects arrested as part of the Federal Bureau of Investigation (FBI)'s investigation into the Boston Marathon bombings are US students from Khazakstan.

Three people were killed and more than 200 were wounded when two bombs were detonated near the finish line of the popular race in April.

Chechen bothers Dzhokhar and Tamerlan Tsarnaev were identified as suspects and the area of Watertown was placed on lockdown while a manhunt for the pair was launched.

Tamerlan was killed during a clash with police while his younger brother was in police custody.

Boston police have taken three more suspects into custody.

It is believed they may have been college students connected to the surviving bomb suspect through the University of Massachusetts Dartmouth, where the 19-year-old was a student.

The Boston Globe reported the three suspects allegedly helped Tsarnaev after the bombings.

Tsarnaev has been charged with using a weapon of mass destruction and is currently in a federal medical facility just outside of Boston.