The CBZC said all six admitted to publishing false messages.
“One of the reasons for this behaviour was that the post was published as a joke. Messages appear online that are intended to cause chaos, panic and disinformation. Their authors exploit the tragedy in an attempt to gain attention on social media. They publish fabricated content without realising the consequences of their actions. Posts of this kind are often shared further online without consideration. The services respond immediately to every such incident,” the CBZC said.
The CBZC also warned that online anonymity was only apparent and that authors of such posts could face serious legal consequences.
The shooting took place on Saturday afternoon in Kraków's Main Market Square. A masked 24-year-old man drove a car onto the square and opened fire on people there.
He was wounded during an exchange of fire with police and detained.
Officers found four firearms in his car, including two AR-15 rifles and two pistols, as well as around 500 rounds of ammunition.
Six people were killed and 16 injured, including two police officers. The attacker was taken to hospital in critical condition and died on Monday morning.
Police also found the bodies of three people, two women and a man, at the attacker's family home in Ostrowiec Świętokrzyski. They were identified as his parents, aged 53 and 52, and his 21-year-old sister. Their injuries were initially assessed as gunshot wounds.
(sp)
Source: PAP