Greek police clashed with more than 500 protesters in an Athens suburb on Sunday evening, using tear gas and stun grenades to disperse the crowd.

The crowd was protesting police violence, but views of what happened earlier Sunday diverge widely.

In an announcement, police say that a motorcycle patrol went to suburb Nea Smyrni’s main square just before 3 p.m. Sunday to investigate “multiple reports” of violations of lockdown measures and that they were set upon by a group of 30 people who injured two police officers. Police reinforcement detained 11 from among the group, police say.