Boston's police commissioner said Sunday that Boston bombers Dzhokhar and Tamerlan Tsarnaev were likely planning a second attack. 

The revelation comes after a cache of weapons were uncovered. 

Boston Police Commissioner Ed Davis told CBS' "Face the Nation" that an arsenal of homemade  explosives were found by authorities after the drama involving the death and capture of the suspects Friday. 

"We have reason to believe, based upon the evidence that was found at that scene  -the explosions, the explosive ordnance that was unexploded and the firepower that they had - that they were going to attack other individuals," Davis said. "That's my belief at this point."

On Friday's gun battle with the suspect, officers said there were unexploded bombs, including one that was found in the Mercedes that the brothers carjacked. "This was as dangerous as it gets in urban policing," Davis said.

Meanwhile, reports are emerging that Dzhokhar tried to kill himself moments before he was captured alive Friday evening by FBI in Watertown, Mass. 

19-year-old Dzhokhar reportedly put a gun in his mouth and pulled a trigger as police closed in on him, resulting in a serious throat injury that is preventing the bomber from talking. 

Investigators want to interrogate him and ask a million questions regarding the bombing, but Dzhokhar is unable to talk due to the bullet wound that went straight to the neck. The interrogation team plan to question Dzhokhar without reading him his Miranda rights. 

Although he remains ventilated and sedated, he is not in critical condition. He is currently stable, but according to Boston Mayor Thomas Menino, the suspect may never be able to speak again. 

"We don't know if we'll ever be able to question the individual," Menino told ABC's "This Week" on Sunday. 

Dzhokhar's older brother Tamerlan died during a police confrontation night. Some reports say Dzhokhar ran over his older brother and that could be what killed him during the police shootout as he ran away. 

The two brothers are suspected of planting two simultaneous bombs close to the finish line at the Boston Marathon. The bomb blasts killed 3 innocent victims and injured 176 people, 17 of which were in critical condition. 

Many of the bomb's victims had their limbs blown off. 

Photos of the bombers were released Thursday by FBI. On the same evening, an MIT police officer was shot dead by the brothers who were on the campus. 

Within 24 hours of the release of the photos, the two brothers were identified, with one dying in a police shootout and another finally taken into police custody. 

One of the largest manhunts in American history came to a culmination Friday evening when Dzhokhar was captured on 76 Franklin St in Watertown, Mass. after hiding in a boat.