A bomb hidden in a box of birds killed 13 people and wounded 57 at a popular pet market in central Baghdad on Friday, police and witnesses said, describing the deadliest attack in the Iraqi capital in two months.

Iraq is facing a health “catastrophe” in the capital Baghdad, with reports of cholera rising sharply over the past weeks to more than 80 new cases, the Health Ministry said on Thursday.

About 60 percent of the foreign militants fighting in Iraq have come from U.S. allies Saudi Arabia and Libya, unidentified U.S. military officials said in a newspaper report on Thursday.