>> reporter: her husband, chris, says before his family vanished, he and his wife had some words for each other. >> it wasn't like an argument. we had an emotional conversation, but -- i'll leave it at that. >> reporter: but he says he last saw his family around 5:00 a.m., monday, when he left their colorado home for work. >> if you're out there, just come back. if somebody has her, just please bring her back. >> reporter: friend nicole says she got worried when shanann, who is also 15 weeks pregnant, missed a doctor's appointment and would not answer texts. >> i'm just concerned. shanann, if you're hearing this or you're out there, please, please let somebody know you're okay. >> reporter: searches of the home and police dogs have turned up few clues. friends tell us shanann's phone, keys and wallet were found here in the family home. local police are now getting help from the fbi. david? >> clayton sandell tonight. clayton, thank you. and one more note overseas for you tonight. the deadly terror attack in afghanistan we're following. at least 48 people were killed by a suicide bomber targeting an education center in kabul.