Notes handwritten by convicted Boston Marathon bomber Dzhokhar Tsarnaev during his initial interrogation with law enforcement officials have been released.

The barely legible collection - all 68 pages - was newly filed by appeals lawyers in court as they seek to suppress Tsarnaev's statements made from a hospital after his April 19, 2013 arrest.

Tsarnaev was taken into custody four days after the double pressure cooker bombing that claimed the lives of three civilians and injured an astounding 264 others.

Appeals lawyers argued that Tsarnaev's statements were made involuntarily - as the wounded perpetrator was too ill to verbally answer questions.

Tsarnaev was in critical condition at the time after he took a shot in the head, neck, legs and hand before his climactic capture.

He penned more than once in the handwritten notes: 'America is at war, is it not?' and in a separate page, he said alongside the same question: 'I did what is necessary.'

Handwritten by convicted Boston Marathon bomber Dzhokhar Tsarnaev during his initial interrogation with law enforcement officials have been released

The above photo shows the moment a second explosion goes off near the finish line of the 117th Boston Marathon on April 15, 2013

Emergency personnel are seen as they respond to the scene of the bombing near the finish line of the Boston Marathon on April 15, 2013

68 pages of the handwritten collection was newly filed by appeals lawyers in court as they seek to suppress Tsarnaev's statements made from a hospital after his April 19, 2013 arrest

In many of the sporadic scribblings, the infamous bomber defended his fellow perpetrator brother, Tamerlan, and asked his whereabouts. Tamerlan was fatally shot by police in Watertown on April 19, 2013.

Tsarnaev wrote in a circled writing: 'Where is my bro?,' and on another page: 'I answered your question. Do you have my bro?'

He inquired further: 'Is my brother alive ... I know you said he is are you lying ... Is he alive?'

The Kyrgyzstani-American terrorist, who is of Chechen descent, insisted that he and Tamerlan were the sole masterminds of the attack.

When speaking of 'that day,' he said that he and his brother 'told no one' beforehand.

'Yes my brother did after me to follow along with him and I very much wanted to .... there's no one else that convinced him.'

He jotted down feelings about his physical turmoil and he said: 'I am tired ... leave me alone,' 'I need to throw up' and 'look at me, I'm hurt.'

He wrote in the final page: 'Can I sleep? Can you not handcuff my right arm? Where is my bro ... are you sure'

Tsarnaev said the pair had no doubt they would get caught and die.

Tsarnaev spoke proudly about the religiously motivated attack and said he and his brother identify as Mujahideen terrorists who 'are promised the highest levels, and when we die, we die with smiles on our faces.'

He further asked if he could have a lawyer and defended the innocence of his sister-in-law, Katherine Russell.

He said Katherine 'didn’t know about the fireworks or nothing' and is 'innocent' as 'an American with an American family.'

Two women and a young boy died in the 2013 bombing near the finish line of the annual race, historically held on Patriots' Day.

The three victims were identified as Krystle Campbell, Lu Lingzi and Martin Richard.

Massachusetts Institute of Technology Officer Sean Collier was shot dead three days after the attack during a standoff with the brothers, hours after the suspects' photos were released by the FBI.

Tsarnaev was sentenced in 2015 to death by lethal injection.

He is currently being held at the United States Penitentiary, Administrative Maximum Facility (ADX), a federal supermax prison for male inmates in Florence, Colorado.