Jurors in the trial of Boston Marathon bomber Dzhokhar Tsarnaev (joh-HAHR' tsahr-NEYE'-ehv) are set to resume deliberations for a second day in the first phase of his death penalty trial.

The jury of seven women and five men began deliberations Tuesday on 30 federal charges against Tsarnaev. They'll return to U.S. District Court Wednesday.

During the trial, Tsarnaev's lawyer admitted Tsarnaev participated in the deadly 2013 attack, but said his older brother was the mastermind.

If Tsaranev is convicted, the same jury will hear more evidence in a second phase of the trial to decide whether the 21-year-old is sentenced to death or life in prison.

Three people were killed and more than 260 were injured when twin pressure-cooker bombs exploded near the marathon's finish line on April 15, 2013.