Boston Marathon Bombing Suspect Dzhokhar Tsarnaev -- Courtroom Showdown Begins

Boston Marathon bombing suspect Dzhokhar Tsarnaev has just arrived to federal court -- in a plain white van -- where he will be arraigned for the April 15 attack.

According to WHDH in Boston, Dzhokhar's van was accompanied by a motorcade -- presumably to keep the bomber safe.

Prosecutors believe Dzhokhar and his scumbag brother executed the horrific Boston Marathon bombing, which killed 3 people -- including an 8-year-old boy -- and injured more than 260 others.

The families of the victims are also expected to appear in court.

Story developing ...