DHS memo says number and pace of attempted attacks have surpassed `` any other previous one-year period '' Attacks are expected to be attempted with `` increased frequency , '' document warns . Score: 6 Terror groups are increasingly using westerners as operatives , report says .
DHS memo says number and pace of attempted attacks have surpassed `` any other previous one-year period '' Attacks are expected to be attempted with `` increased frequency , '' document warns . Report cites recent cases of homegrown terrorism , including failed Times Square bombing . Terror groups are increasingly using westerners as operatives , report says .