DHS report says number and pace of attempted attacks have surpassed ` ` any other previous one - year period '' The document also says Shahzad and Zazi had short periods of training overseas `` compared to lengthier training cycles for earlier operations , reducing our ability to detect their activities . '' They are expected to be attempted with ` ` increased frequency , '' document says . Report on recent cases of homegrown terrorism , including failed Times Square bombing . Terror groups are increasingly using westerners as operatives , it says .
DHS report says number and pace of attempted attacks have surpassed ` ` any other previous one - year period '' They are expected to be attempted with ` ` increased frequency , '' document says . Report on recent cases of homegrown terrorism , including failed Times Square bombing . Terror groups are increasingly using westerners as operatives , it says .