Montenegro declared three days of national mourning on Saturday, a day after 10 people, including two children, were killed in an attack by a 34-year-old shooter who police said had recently shown a "

The attacker used a hunting rifle to first shoot to death two children, aged 8 and 11, and their mother, who lived as lodgers in his house in the Medovin district in the west of the city of Cetinje. He then went outside and randomly shot another 13 people, seven of whom were killed.. The shooter was later killed in a shootout with police..

Police investigating the attack released a statement on Saturday saying it is not yet clear what motivated the shooter, who is still referred to only by his initials.. But people close to the assailant said that recently he began to show changes in behavior, but nothing indicated that he could have committed such a crime..

The assailant had an appointment with a mental health specialist, but went on a rampage before it..

The police report also said that law enforcement officers sent to the scene came under fire from the attacker and fired at least 20 times at him in response, seriously injuring him..

“Whether he died as a result of being severely wounded (by the police) or as a result of being shot at by a local resident is yet to be ascertained,” the statement said..

The prosecutor coordinating the investigation, Andrijana Nastic, told reporters on Friday that the shooter was killed by a passer-by and that a police officer was among the injured.. She said nine of those killed died at the scene and two died in the hospital..

Witnesses to Saturday's attack struggled to come to terms with the carnage. They described scenes of chaos and horror as the shooter unleashed his fury on innocent people who were just going about their daily business on a warm summer day..

" I heard shots,” said witness Milena Stanojevic.. "

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Cetinje, a city of 17,000 people and the seat of the former royal government of Montenegro, is 36 kilometers west of Podogritsa, the current capital of a small Balkan country.

Four wounded were transferred to a clinical center in Podgorica for operations.

They are in intensive care now.. Two others received less serious injuries and are being treated at a hospital in Cetinje..

Recall that in February, a Norwegian court denied the request of the killer of 77 people, Anders Breivik, for parole and ruled that he must remain in prison.. In 2011, Breivik blew up a car filled with half a ton of explosives in the government quarter of Oslo, and then staged a mass execution of vacationers on the island of Utoya..