A Pakistani analyst says the "spectacular nature and coordination" of the Sri Lankan suicide blasts that killed at least 310 people likely points to a connection between the attackers and "more sophisticated groups."

Sri Lanka bombings: It would've taken months and months to plan these attacks

The CCTV footage showing a suspected suicide bomber entering St Sebastian's church in Negombo, on Sunday.

CCTV video shows suspected suicide bomber entering Sri Lankan church

WION correspondent Sidhant Sibal witnessed an explosion near the St Anthony's church in Colombo which police later confirmed was a "controlled explosion".

'Controlled explosion' near St Anthony's church in Colombo

Mangala Samaraweera, Minister of Finance, Sri Lanka termed Easter Sunday bomb blasts in churches and hotels a well-coordinated attempt to create murder, mayhem and anarchy and urged the people to unite with nerves of steel to defeat this ''heinous attempt.

Sri Lankan minister terms blast 'coordinated attempt to create anarchy', urges people to unite with 'nerves of steel'

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Sri Lanka bombings: It would've taken months and months to plan these attacks

CCTV video shows suspected suicide bomber entering Sri Lankan church

'Controlled explosion' near St Anthony's church in Colombo

Sri Lankan minister terms blast 'coordinated attempt to create anarchy', urges people to unite with 'nerves of steel'