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He added that one blew himself up and the other was “neutralised”, which usually means was killed, while the two officers were slightly injured in the incident at 9:30am (06:30 GMT).

Police also announced they would carry out controlled explosions for “suspicious package incidents” in other parts of Ankara.

Authorities did not identify any specific armed group.

The incident comes almost a year after six people were killed and 81 wounded in an explosion in a busy pedestrian street in central Istanbul. Turkey blamed Kurdish militants for the explosion.

Erdogan was set at 7:30pm to attend the opening of parliament, which in the coming weeks is expected to consider ratifying Sweden’s bid to join NATO after Turkey had raised initial objections and delayed enlargement of the bloc.

President of the European Council Charles Michel said he strongly condemned what he called the “terrorist” attack, while EU Commissioner for Enlargement Oliver Varhelyi said it supports Turkey “in its fight against terrorism”.