Police in the Bulgarian Black Sea city of Bourgas detained two groups of illegal migrants in the city, the Interior Ministry said.
One group of 26 men was found in a cargo van which had Sofia licence plates. The second group consisted of 27 men and a woman, travelling in a bus with Plovdiv plates.
Criminal charges have been laid against the drivers. After questioning, the migrants were to be accommodated in special homes in Bourgas.
On October 6, reports said that about 30 illegal migrants had been detained in Sofia in an operation by police in the Bulgarian capital city.
The migrants were found in an van that had been stopped by police for inspection. At the sight of the police, some passengers tried to escape but were detained. Initial information was that the migrants said that they were from Syria.