Mourning for Moscow metro victims
By CNN Moscow Bureau Chief Jill Dougherty
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Friends of Ivan Aladyin, one of the victims, at his funeral in Moscow.
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Officials investigate deadly blast on Moscow subway.
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MOSCOW, Russia (CNN) -- Flags across Moscow flew at half-staff and TV stations canceled entertainment programs Monday as Russians held an official day of mourning for the victims of last week's subway bombing that killed 39 people.
Families of some of the victims were burying their loved ones Monday, while other funerals and burials will be held Tuesday.
More than 100 people injured in Friday's attack remain hospitalized -- many in serious condition.
For many in Moscow, Monday is also a reminder of their own vulnerability as they are faced with using the metro to commute to work. More than eight and a half million people ride city's subway system daily.
Investigators continue their work, inspecting the subway car where the explosion occurred and questioning passengers who might have seen how the attack was carried out. Police released a composite sketch of a man suspected of involvement in the bombing.
Meanwhile Monday a top official with Russia's Federal Security Service said the agency's investigators believe a suicide bomber most likely carried out last week's attack.
Vyacheslav Ushakov, Deputy Director of the FSB, offered their leading theory to lawmakers Monday morning, according to Russia's Interfax news agency.
Russian President Vladimir Putin has blamed Chechen rebels for the attack, pointing the finger specifically at rebel leader Aslan Maskhadov. A charge Maskhadov's spokesman has denied.
Experts on the region say Maskhadov does not maintain complete control over all rebel groups and even Russian authorities say international terrorists also are operating in Chechnya.
