"I've never seen anything like this," Beroe coach Petar Hubchev said.
"I was not in the tunnel at the time of the incident and firstly, I would like to talk to people who created this nonsense," added former defender Hubchev, who was in the Bulgaria team that reached the 1994 World Cup semi-finals.
Beroe were reduced to eight men when Brazilian midfielder Elias received a second bookable offence for diving midway through the second half but the Stara Zagora-based side held their two-goal lead from the first half.
Beroe, the 1986 Bulgarian champions, competed in this season's Europa League qualifying rounds after winning the national cup in May.
- Sports & Recreation
- Petar Hubchev
- Ivan Karadzhov