KIEV, Oct. 17 (Xinhua) -- Ukrainian President Petro Poroshenko has expressed his condolences to the families of victims in the attack on a college in the city of Kerch in Crimea on Wednesday, the presidential press service said.
Poroshenko called the attack a "tragedy" and a "terrible murder", saying investigation in the attack is important for Ukraine.
At least 19 people, mostly teenagers, were killed and 40 others were injured earlier in the day when an unknown explosive device went off in a canteen of the Kerch Polytechnic College around midday local time (0900 GMT). The blast was accompanied by shooting.
The Crimean prosecutor's office and the Russian Investigative Committee have opened separate criminal investigations into the incident on charges of a "terrorist act."
Later in the day, the Russian Investigative Committee said the case was a "mass murder" and named 18-year-old Vladislav Roslyakov as a suspected shooter.
Roslyakov, a fourth-year student of the college, has committed suicide after the attack, the committee said in a statement.
Crimea was incorporated into Russia in March 2014 following a local referendum. Ukraine says the peninsula was annexed.
