Two bombs have exploded in a busy central Baghdad square, killing six people and wounding about 20 others, police say.
As many as 10 policemen were wounded in the near simultaneous blasts, which damaged many of the surrounding shops.
The bombs were detonated near a police headquarters, reports say.
The number of bombings in Baghdad has fallen in the last year, but two weeks ago an attack on a minister there killed nine people and wounded 20.