Boston, MA, Jan. 5 (UPI) -- Boston police are "turning up the heat" on a violent East Boston gang recently linked to ... al-Qaida ... The gang, La Mara Salvatrucha or MS-13, has roots in El Salvador and been tied to machete attacks, rapes and home invasions. It allegedly has 100 "hard-core members" in East Boston with hundreds more in towns along the North Shore.... . But intelligence officials in Washington have warned in recent weeks that al-Qaida members have been seen in El Salvador with MS-13 members, raising concerns the gang may be smuggling terrorists into the United States....