Many questions still surround the second suspect in the Boston Marathon bombings, but 19-year-old Dzhokhar Tsarnaev reportedly woke on Sunday night and is communicating with police through writing.
The lone surviving suspect remains under armed guard in serious but stable condition, and several news agencies report he has been intermittently conscious but still cannot speak due to throat injuries. Authorities believe Tsarnaev may have sustained the wound to his neck in a suicide attempt following a shootout with authorities on Friday.
Boston Police Commissioner Ed Davis insists Tsarnaev and his elder brother, 26-year-old Tamerlan, planned additional attacks, and a special interrogation team with the FBI has been brought in to interrogate Tsarnaev in the hopes of uncovering a motive or other conspirators.
"We have reason to believe, based upon the evidence that was found at that scene -- the explosions, the explosive ordinance that was unexploded, and the firepower that they had, that they were going to attack other individuals," Davis said.
Currently, investigators believe the brothers acted alone -- but they still don't know why. Nearly two days after the dramatic capture of the younger Tsarnaev, investigators hope he will tell them.
The U.S. Attorney's Office confirmed that charges would not be filed on Sunday.
Yet even as reports of communication emerge, the debate over whether investigators should read Tsarnaev his Miranda rights continues to rage on. Investigators are currently applying a "public safety exception" which delays that disclosure. Meanwhile, several prominent Republican senators have called for Tsarnaev to be treated as an enemy combatant.
Also on Sunday, Boston Mayor Tom Menino welcomed a new week.
"Today, it is time to move forward, move this city forward," he said.
Officials plan to reopen the site where the bombings took place, but residents won't soon forget the events of last week. Instead, the city came together in song and prayer on Sunday in the streets and in houses of worship.
"It's very difficult to understand what was going on in their heads," said Cardinal Sean O'Malley, of the Cathedral of the Holy Cross.
Investigators hope to learn what motivated the Tsarnaev brothers to allegedly kill and maim. The twin bombings on Patriot's Day followed by the explosive chase and gun battles with police left a total four people dead and more than 180 injured.
The Massachusetts State Police used heat-seeking, infrared technology on Friday to find Tsarnaev hiding under a tarp in a boat before the final gun battle with law enforcement on Friday. The Forward-Looking Infra-Red technology, known as FLIR for short, is commonly found on police helicopters across the country.
In fact, the Minnesota State Patrol has it mounted on choppers for the purpose of finding suspects hiding under things, particularly in the dark.
"What you saw yesterday in Boston, we have seen it several times in the State Patrol," Dave Latt, chief warrant officer with MSP, told FOX 9 News. "We've caught people hiding on boats under cover. The cover is thin enough that FLIR detects the heat from the body through the canvas."
Just last month, the Minnesota State Patrol used the technology to arrest a suspect hiding in a wooded area near St. Cloud at 11:30 p.m.