Some of these kinds of violence continue to be perpetrated by certain individuals and groups in the new Iraq.   Mahmoud continued, "In the last six months at least eight women have been killed in Mosul alone - all apparently by Islamic groups clamping down on female independence. Among these, a professor from the city's law school was shot and beheaded, a vet was killed on her way to work, and a pharmacist from the Alkhansah hospital was shot dead on her doorstep."
 More than 8 women were killed in Mosul in the last 6 months
From the context we know that at least 8 women were killed. The use of 'at least' implies that more than 8 may have been killed, but we don't know for sure. It is therefore fair to say that saying more than 8 women were killed is neither definitely correct nor definitely incorrect, as it may just be 8 women, or it may be more. The system likely did not understand that by saying at least 8 women were killed, it adds a level of uncertainty. 
( z1 kill :ARG1 ( z2 woman :quant ( z3 more-than :op 8 ) ) :location ( z4 city :name ( z5 name :op "Mosul" ) ) :time ( z6 before :op ( z7 now ) :duration ( z8 temporal-quantity :quant 6 :unit ( z9 month ) ) ) )