Boston, Massachusetts -- Police said they wanted Dzhokhar Tsarnaev alive so he could tell them why he and his brother allegedly did this. Apparently, that's what's happening.
The 19-year old has started answering investigators' questions in his hospital room, where he's still in serious condition. He has to do it in writing because of a gunshot wound to his throat.
We've been told he's providing "substantive" information. ABC News reports he's specifically writing "about other [terror] cell members and other unexploded bombs."
Boston police believe Dzhokhar and his brother Tamerlan were planning more attacks on others when police tracked them down on Friday.
The questioning is happening as investigators prepare their list of charges against Dzhokhar, which will likely be filed Monday.
Two top members of Congress are publicly calling out intelligence leaders. They're asking why Dzhokhar's dead brother Tamerlan wasn't pursued further after the FBI questioned him two years ago.
This is the fifth time in recent years that someone under FBI investigation has gone on to be involved in a terrorist attack.
On 60 Minutes -- which airs Sunday nights on 10 News -- Boston's police commissioner told Scott Pelley about the final takedown of Dzhokhar Tsarnaev.
"The gun battle continued until one of the suspects ran out of ammunition. And one of the sergeants tackled him to the ground," Commissioner Ed Davis said.
"A police officer ran out and tackled him, these men who had armed themselves with so many explosives?" Pelley asked.
"That's correct. That's what happened. It probably would not be advised as a tactical move. But it shows the courage and commitment that officers have," Davis answered.
In the chase before that takedown, transit police officer Richard Donohue was hurt. He is still in critical condition, but considered stable, in the hospital.
Police have released this photo showing Donohue on left, together with slain MIT police officer Sean Collier. The picture was taken at a police graduation ceremony.
The private funeral for victim Krystle Campbell will be held Monday. Hundreds of people came to pay their respects at a public wake in her hometown of Medford on Sunday.
Monday night, there will be a memorial service at Boston University. Students and staff will remember grad student Lingzi Lu, who was also killed in the attacks.
Boston police are reopening the six-block area around the marathon bombing site Monday morning. It comes just hours before the entire state of Massachusetts will pause for a moment of silence.
The moment of silence will come at 2:50 Monday afternoon. It will mark precisely one week from the time the first bomb went off.
Grayson Kamm, 10 News