The father of the suspected Boston Marathon bombers encouraged his younger son to give up peacefully, but warned the U.S. that "all hell will break loose" if his son is killed, ABC News reported.

Anzor Tsarnaev spoke to ABC from the Russian city of Makhachkala. He said he spoke to his sons earlier in the week about the bombing, and that his sons reassured him saying, "Everything is good, Daddy. Everything is good."

The elder of the two brothers, Tamerlan Tsarnaev, 26, was killed during a hectic night where the two allegedly killed an MIT police officer, hurled explosives at police and engaged in a car chase and gun battle.

Dzhokhar Tsarnaev is still on the loose, and Boston police have effectively shut down the city in their hunt for him.

Classmates told ABC News that Dzhokhar "never seemed out of the ordinary" and was not troubled or shy during high school.