An official says al Qaeda bombmaker Ibrahim Asiri is behind the latest efforts . `` The information is that terrorists are aware of this type of technique and interested in using it , but there is no specific threat as to a date and time and a specific flight , '' he said . Security official says terrorists have shown renewed interest in implanting explosives . Airlines and overseas allies were briefed last week . The U.S. government has been tracking a number of recent plots to attack targets inside or outside the United States, including an attempt by two men from Yemen who tried unsuccessfully to detonate bombs aboard cargo planes bound
An official says al Qaeda bombmaker Ibrahim Asiri is behind the latest efforts . Security official says terrorists have shown renewed interest in implanting explosives . Airlines and overseas allies were briefed last week . The U.S. government has been tracking a number of recent plots to attack targets inside or outside the United States, including an attempt by two men from Yemen who tried unsuccessfully to detonate bombs aboard cargo planes bound