Story highlights The rockets with chemical substances were fired in a residential part of the northern Iraqi town of Taza, officials say

The U.S. claims to have captured an ISIS operative involved in ISIS' chemical weapons program a few weeks ago

They launched airstrikes based on info he's provided, but terrorists have continued their attacks as well

(CNN) Suspected terrorists with links to ISIS on Saturday fired rockets containing unspecified chemical substances into a residential part of the northern Iraqi town of Taza, Iraqi security officials told CNN.

The attacks caused an unspecified number of casualties from suffocation, burns and dehydration.

Taza, which has a predominantly Shiite Turkmen population, is located about 12 miles (20 kilometers) south of Kirkuk.

A U.S. Special Operations team captured a senior ISIS operative involved in chemical weapons about three weeks ago. Several officials have said U.S.-led warplanes have since conducted airstrikes targeting chemical weapons sites based on information provided by this man, who has been identified as Sleiman Daoud Al-Bakkar.

His capture, however, has not stopped alleged chemical attacks by ISIS or other terrorists associated with the Islamist militant group.

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