Grenades used in three recent attacks in Monterrey, Mexico, and Pharr, Texas, all originated from the same lot delivered from South Korea... That the grenade used in the third attack reportedly came from Mexico indicates that in addition to the well-known path of weapons flowing from the United States into Mexico, arms also are flowing from Mexico into the United States. The first of the three attacks targeted the U.S. Consulate in Monterrey, Mexico. In the second incident, again in Monterrey, gunmen attacked a local TV station on Jan. 12 in an attempt to intimidate the news agency into cutting...