Watch: Exact moment suicide bomber enters Sri Lanka’s St Sebastian church

The new CCTV footage that has appeared shows a man carrying a heavy backpack walking across the cobblestoned front yard of the St Sebastian Church before entering the church hall and blowing himself up killing as many as 50 people inside the premises itself.

New footage has appeared showing one of the suspected suicide bombers in Sunday’s Easter attack in Sri Lanka entering St Sebastian’s church in Negombo.

The suspected suicide bomber can be seen walking across the cobblestoned front yard of the St Sebastian church before entering it where he blew himself up killing as many as 50 people inside the church. (ANI/Screengrab)

The 26-second video begins with a man carrying a backpack appearing to pat a little girl even as he talks to a man accompanying the girl and then steps away.

As the man and little girl walk away, the suspected suicide bomber - a bearded young person wearing a pair of dark coloured trousers and a tee-shirt and slippers and carrying a heavy-looking backpack - walks across the cobblestoned yard outside the church.

The frame changes to inside the church, which is fully packed with people sitting on almost every pew and praying. In the background, the man can be seen moving across the first and second doors which are open and finally entering the church through the third door.

WATCH: Sri Lanka: CCTV footage of suspected bomber entering church before blast

The video stops just as the man enters the church premises.

The subsequent explosion that followed was the deadliest witnessed in Sri Lanka in recent years. Such was the intensity of the blast that it killed more than 50 people inside the church complex.

Apart from this suspected bomber, a pair of Muslim brothers are reported to have carried out the hotel suicide blasts in Sri Lanka on Easter Sunday. The Sunday bombings had left 320 people dead and more than 500 others injured with many of them critical.

The two brothers, said to be sons of a wealthy Colombo spice trader, were among the suicide bombers who hit three churches and three luxury hotels, investigators say.

Just before he entered the StSebastian Church, the suicide bomber can be seen crossing the first and second doors of the church and entering through the third one. (ANI/Screengrab)

The investigating agencies have not revealed the names of the two brothers, but said that they were in their late twenties and operated their own “family cell”.

Though the Islamic State has claimed responsibility for the attack, the Sri Lankan government beleives that the attack was carried out by the Islamist National Thowheeth Jama’ath (NTJ), of which the two brothers were key members.

Among the dead were also 10 Indians.

“Regret to confirm the deaths of two more Indian nationals Mr. A Maregowda and Mr. H Puttaraju in the blasts in Sri Lanka on Sunday, taking the total number of Indian deaths in the tragedy to 10 as of now,” external affairs minister Sushma Swaraj tweeted.