The Czech Republic's Foreign Ministry says it wants Russia to explain why authorities there stopped a Czech diplomatic vehicle and demanded the driver take a breath test — an incident that happened to be witnessed by a local television crew.

Ministry spokesman Vit Kolar says it is not clear why the car was stopped Thursday in the Ural Mountains city of Yekaterinburg.

The Czechs rejected the breath exam request on grounds of diplomatic immunity.

Kolar asserted Friday that the car's driver had committed no traffic offense. The vehicle belongs to the local Czech consulate.

He said the Czechs' suspicion was especially aroused because the TV crew was present during the encounter.