Insufficient security measures in Moscow's Domodedovo airport are to blame for Monday's deadly blast, which left 35 dead, a spokesman for Russia's national anti-terrorism committee (NAC) said on Tuesday.
"Security measures in the Domodedovo airport were insufficient, otherwise the terrorist attack would have never taken place," Nikolai Sintsov told the Rossiya 24 TV channel.
According to preliminary reports, a suicide bomber blew himself up in the airport's crowded international arrivals hall Monday afternoon, killing at least 35 people and injuring up to 180.
In its latest report, Russia's health ministry said at least 100 people were taken to hospitals after the blast.
"Hundred of people are in hospitals as of 2 Moscow time (23:00 GMT). We estimate... that 48 of them are in serious and critical condition," deputy health minister Maxim Topilin said.
The bodies of five victims have already been identified.