A mangled bus is hauled away in Volgograd as officials pick up the pieces after the latest bombing in Russia.<br /> <br />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.<br /> <br />Safety has become the residents' number one concern.<br /> <br />(SOUNDBITE) (Russian) VOLGOGRAD RESIDENT, SERGEI, SAYING:<br /> <br />"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."<br /> <br />Russian President Vladimir Putin ordered law enforcement agencies to increase security.<br /> <br />At a central square, dozens of residents gathered to remember the victims.<br /> <br />As the gathering got underway, police began to arrest some of the people, including a man holding a flag with a hammer and sickle.<br /> <br />An organizer said law enforcement agencies have failed to protect the country from terrorism.<br /> <br />(SOUNDBITE) (Russian) VOLGOGRAD
