First you edit your antivirus and antispyware policy which is applied to the group which the client resides.Go to Miscellaneous ---->log handling and ensure that all required logs are selected .
Then come to Clients---> <the req. group>---->policies---->client log settings and ensure that security log is selected.
Then come to monitors--->logs --->Network threat protection--->attacks view log .(I am predicting you are telling about the Intrusion Prevention logs, if other than that tell us exactly which type of information you req. As Visu told in manager reports are splited to many .So for more accurate info. pls t;ll us which type of entry you are referring to..)