The college in Crimea where a teenage gunman killed 20 people last week reopened on Wednesday with tearful students attending classes in different buildings as some parents chose to withdraw their children.The Kerch technical college, which admits children from the age of 14, lost 20 students and staff last Wednesday when student Vladislav Roslyakov went on a shooting rampage. The 18-year-old also set off explosives in one of the school's buildings.That section, which was seriously damaged in the explosion, has now been closed off and classes rescheduled in other buildings nearby. Police were overseeing security on the grounds, an AFP correspondent observed.About one hundred final-year students have been sent away on internships to allow the college to function on limited premises, Crimea governor Sergei Aksyonov told local media.Nearly 50 people are still hospitalised with injuries sustained in the attack, he said.Twenty-two families have said they want their children to go to other schools, he added.Aksyonov said the Russian national guard would now provide security in Crimean schools to "help convey the feeling of security and safety to people."At the college, people were seen adding flowers to an informal memorial with photos of the victims. Some students were crying and comforting one another outside the buildings.The perpetrator of last week's attack, who was found dead with a gunshot wound on site, was shown in camera footage wearing a similar t-shirt to Eric Harris, one of the killers in the 1999 Columbine High School shooting in the US, which left 13 people dead.Russian President Vladimir Putin blamed the attack on "globalisation" and online communities dedicated to American school shootings which promoted "fake heroes."