Sri Lanka police and security hunt for bombing suspects

Authorities aim to prevent further attacks and clamp down on religious extremism.

    Sri Lanka's defence secretary has resigned following Sunday's suicide bombings.

    Security services remain on high alert.

    The United States and the UK are warning about the possibility of more attacks.

    The UK is advising its nationals to avoid travelling to Sri Lanka unless it's absolutely necessary.

    Al Jazeera's Florence Looi reports from Colombo.


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