Boston Marathon bombing suspect Dzhokhar Tsarnaev pleaded not guilty to 30 counts against him today, including use of a weapon of mass destruction to kill. Tsarnaev entered the plea in federal court in Boston.

According to the Associated Press, his sister sobbed loudly as he left the courtroom. He looked over and made a kiss motion with his mouth to his family.

Federal prosecutors have not determined if they are going to pursue the death penalty for the 19-year-old Tsarnaev.

Authorities say he and an older brother, Tamerlan, planted two bombs, which killed three people and wounded more than 260 at the Boston Marathon on April 15. Tsarnaev's older brother was killed three days after the bombing in a shootout with police.

Information from the Associated Press used in this report