Violence tied to Somali-American gangs in the Twin Cities metro erupted in recent days, with law enforcement recovering nearly 100 casings after a gunfight captured on a resident’s surveillance camera — as officials warn they need help to contain the problem before it escalates.The warning follows a burst of violence across several Twin Cities suburbs — including a Bloomington shootout that left nearly 100 shell casings and another shooting in Eden Prairie — as law enforcement says the incidents have entered a retaliation cycle and officials race to disrupt the groups before the violence evolv...