A mangled bus is hauled away in Volgograd as officials pick up the pieces after the latest bombing in Russia.
Two days of bombings - one on a trolleybus and another at the city's main railway station - have killed 30 and injured more than 100.
Safety has become the residents' number one concern.
(SOUNDBITE) (Russian) VOLGOGRAD RESIDENT, SERGEI, SAYING:
"I think that of the people standing here, no one would tell you that they feel safe. A lot has been promised, but little has been done. It's clear, everyone can see it."
Russian President Vladimir Putin ordered law enforcement agencies to increase security.
At a central square, dozens of residents gathered to remember the victims.
As the gathering got underway, police began to arrest some of the people, including a man holding a flag with a hammer and sickle.
An organizer said law enforcement agencies have failed to protect the country from terrorism.
(SOUNDBITE) (Russian) VOLGOGRAD