Russia news agencies quoted the Moscow region's health ministry as saying that a 45-year-old man and a 40-year-old woman have been taken to the hospital from the Moscow Regional Court with gunshot wounds.
The agencies earlier quoted a lawyer who was at the courthouse and saw a guard and a court official injured.
Authorities said the incident took place during a hearing in a case of a gang of nine people who are suspected of killing more than a dozen of motorists.
Prosecutors said the gang members were placing spikes on roads, forcing the motorists out of their vehicles and shooting them dead.
The nine men, all from Central Asia, are charged with 17 murders and two attempted murders.
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