Colombo, Sri Lanka (CNN) The ongoing hunt for terrorist suspects in Sri Lanka, and fears of reprisal attacks, have cast a shadow over the country still reeling from the devastation of the Easter Sunday bombings.

Sri Lankans of different faiths were being urged to pray privately amid fears of further attacks Friday, as the country's prime minister told CNN that security forces were also working to pick up any terrorist "sleepers" -- who could activate to initiate another round of attacks.

As Sri Lanka enters its first weekend of religious services following Sunday's mass bombings, Catholic services across Colombo have been suspended and the government urged Muslims not to gather publicly for the Friday prayer service known as the Jum'ah prayer.

Driving through Colombo, a CNN reporter observed that shops that would normally be open at midday had been shuttered, and noted that security warnings broadcast on television and radio had spread fear.

According to a revised death toll, 253 people, including many worshipers attending Easter Mass services, died in the coordinated attacks.

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