investigation? >> reporter: alex, good day. today, mali is in a state of emergency following that horrifying attack at the radisson blu hotel in the country's capital friday morning. at least 20 people are dead. including one american. she's been identified as 41-year-old anita datar from maryland. her family says they're devastated. president obama expressing condolences overnight. two american special forces who happen -- special agents who happened to be close by assisted the high risk rescue operation. the united nations says at least two heavily armed gunmen stormed the hotel and witnesses say they were shooting at everything that moved. releasing hostages who could prove they were muslim by reciting passages from the koran. but killing those who couldn't. malian security forces launched a counterattack ending the siege which lasted for several hours and killing the attackers. the group claiming responsibility is an african