reporter: the brutal attack comes in a year marked by deadly violence in the region just weeks ago, cartel gunmen storm the city of culiacan, killing eight, injuring 20 more a siege forcing the government to release the son of infamous drug lord el chapo guzman, who had been captured president trump tweeting today this is the time for mexico, with the help of the united states, to wage war on the drug cartels. president trump later spoke with the mexican president. both condemned the attack the u.s. offering assistance to ensure the perpetrators face justice. tonight, mexican authorities continue to work the chaotic scene, looking for the gunmen who slaughtered three american mothers and their six children tonight officials at this tucson hospital where the survivors were airlifted are being incredibly guarded. they will not release any information r coitions lester all right miguel, thank you. also breaking this evening, a bombshell development in the house impeachment inquiry