Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Irbil, Iraq (CNN) A suicide attack on a busy commercial street in Baghdad has left at least 28 people dead and scores wounded, according to local authorities. Two suicide bombers carried out the attack in the center of the city Saturday, according to Gen. Saad Maan, a spokesman for Baghdad Operations Command. At least 53 were wounded in the twin explosions in al Sinag street, a historic thoroughfare in central Baghdad. So far, no claims of responsibility have been made for the attack. Deadly tactic Iraq -- and particularly its capital, Baghdad -- has long suffered at the hands of suicide bombers.At least 28 killed, 53 injured in double suicide attackAttackers targeted a busy commercial street in the heart of Baghdad 
 Question:In September, three separate attacks on one day in _ killed at least 15 people.

Baghdad