Stefan Raichev told a news conference the strike by more than half of the 1,380 traffic controllers and technicians would paralyse traffic which has increased by 10 percent since last year .
<response> <person>Stefan Raichev</person> told a news conference the strike by more than half of the 1,380 traffic controllers and technicians would paralyse traffic which has increased by 10 percent since last year . </response>