The explosion in the Cathedral Quarter of Belfast occurred as officers were clearing the area after receiving a telephoned bomb warning, UTV has reported.
The warning was phoned into the Irish News at around 6pm before the bomb partially exploded just before 7pm in the Exchange Street West area.
More top news
Wet weather to end the weekend.
The widower of murdered MP Jo Cox has quit two charities set up in her memory after sexual assault allegations from his past resurfaced.
A cold and frosty night so a freezing start for those up bright and early.