(CBS News) WASHINGTON -- The voice of Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, was heard for the first time Tuesday. He said he has supporters, who've been giving him money.
At her home in Dagestan, Zubeidat Tsarnaeva played parts of a taped phone conversation for a reporter. She says the call with her son Dzhokhar occurred last week.
Speaking in Russian, from a federal prison hospital in Massachusetts, the accused Boston Marathon bomber told his mother he was recovering from gunshot wounds. She asked if he was in pain.
"No, of course not," he said. "I'm already eating and have been for a long time. They are giving me rice and chicken now, everything's fine."
In excerpts of the phone call, Dzhokhar cautioned his mother not to discuss his case.
"Everything is good, please don't say anything," he said.
While he's talking to his mother and father, Dzhokhar is no longer talking to the FBI and prosecutors. But, sources say, before being read his rights, he did confess to the bombings. Dzhokhar said he and his brother Tamerlan wanted to avenge the killing of Muslims by U.S. troops overseas.
A similar claim was found written on the boat Dzhokhar had used as a hiding place before he was captured.
After the phone call, Dzhokhar's mother again insisted her sons are innocent.
Watch: Motive discovered for Boston marathon bombings, below.
"It is terrible what happened, you know, but I know my kids did not do it," she said.
In replaying the tape, she became emotional. On the call, Dzhokhar was not.
"I felt like he would scream, 'What's going on? What's going on?' That he would ask the world, 'What's going on?' But mama, instead he was just calming me down, you know what I mean?" said Zubeidat Tsarnaeva.
Dzhokhar also told his parents he did not need any money from them. He said someone has deposited about $1,000 in his prison account. Dzhokhar is charged with using a weapon of mass destruction; more charges are expected, and prosecutors could push for the death penalty.