KANDAHAR, Afghanistan — Five suicide bombers stormed a government office in Kandahar on Wednesday morning, killing 13 people, including two provincial government officials, and wounding 14.  One militant detonated a car bomb at the entrance gate of the provincial council office, as the others stormed the compound with assault rifles and hand grenades. Seven civilians and six police officers were killed in the 20-minute gun battle, which ended when two of the militants blew themselves up in the main hall, said the provincial police chief, Matiullah Qati.
Six civilians and seven police officers were killed.
The statement is in the correct category because the excerpt says that seven civilians and six police officers were killed, not the other way around. The system may have had difficulty due to the very similar numbers.
( z1 kill :ARG1 ( z2 and :op ( z3 civilian :quant 6 ) :op ( z4 officer :quant 7 :mod ( z5 police ) ) ) )