we don't have a person of interest. we're exploring every possibility. >> reporter: what we don't know and what the austin police department won't confirm is whether the search has expanded. with the intensive search for evidence over a sprawling complex, members of the community are stepping up. >> just encouraged people to be prayerful, but hopeful. >> reporter: the pastor at gateway church is hosting a volunteer search effort >> we have a faith bigger than our circumstances, and we continue to pray for a better ending. >> reporter: a community clinging to hope for the safe return of this mother and her baby sam brock, nbc news, austin. there is more to tell you about this evening. just ahead, a health alert, tied to bacteria with that puppies in pet stores. what you need to know to keep your family safe. also, with just one week under christmas, the last-minute blitz online and in stores to get you to buy. the big discounts,