Update, Monday: There are now federal charges, delivered to Dzhokhar Tsarnaev as an American citizen, in his hospital bed (reportedly along with his Miranda warning), and they involve pressure cookers as WMDs, even as questions surround the investigation and his family. Read the full transcript of the hearing below:
Update, 8:34 p.m.: Sources tell ABC News and NBC News that Dzhokhar Tsarnaev regained consciousness and began answering written questions from police on Sunday night. The 19-year-old is still in serious condition but is reportedly fielding questions about other potential members of a terrorist cell and unexploded bombs that might still be out there. It remains unclear if Tsarnaev will ever be able to talk again after taking a gunshot wound to the throat.
Meanwhile, more details about Dzhokhar and his brother Tamerlan continue to emerge. The Los Angeles Times managed to track down the brothers' mother, Zubeidat Tsarnaev, who characterized her last conversation with the older, now late Tamerlan just hours before his shootout with police last Thursday night. "He would call me every day from America in the last days," she told The Times from her home in Dagestan, "and during our last conversation on the morning [before the shootout], he was especially touching and tender and alarmed at the same time. He said he got a private phone call from [the FBI] and said that they told him he was under suspicion and should come see them." Just before hanging up, he added, "If you need me, you will find me."