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Britain and Ireland are making a new push to restore Northern Ireland's collapsed government, amid mounting criticism of politicians following the murder of a journalist by a banned militant group.

The two governments are expected to make an announcement Friday about talks to revive the power-sharing administration, which has been suspended for more than two years because of a dispute between the main Protestant and Catholic parties.

Security officials warn that political drift in Northern Ireland could embolden those bent on violence.

Pressure on politicians has grown since the killing of journalist Lyra McKee, shot dead by an Irish nationalist militant during rioting in Londonderry last week.

Police have released video footage of a stocky, masked man they say is a key suspect and have urged residents to help identify him.