Gunmen killed seven women and five men at a brothel in the Iraqi capital on Tuesday, security and medical officials said.
The attack took place at an apartment in the Zayouna area of east Baghdad, where a similar attack took place last year.
On May 22, gunmen attacked a house in Zayouna that was used as a brothel, killing 12 people.
The week before, gunmen restrained police at a checkpoint in the area, and then shot dead 12 people at a row of adjoining alcohol shops nearby.
Violence in Iraq has reached a level not seen since 2008, when the country was just emerging from a brutal period of sectarian killings.
It took just five days for this month's death toll to surpass that for all of January last year.