( CNN ) -- About 10 men armed with pistols and small machine guns raided a casino in Switzerland and made off into France with several hundred thousand Swiss francs in the early hours of Sunday morning , police said . The men , dressed in black clothes and black ski masks , split into two groups during the raid on the Grand Casino Basel , Chief Inspector Peter Gill told CNN . One group tried to break into the casino 's vault on the lower level but could not get in , but they did rob the cashier of the money that was not secured , he said . The second group of armed robbers entered the upper level where the roulette and blackjack tables are located and robbed the cashier there , he said . As the thieves were leaving the casino , a woman driving by and unaware of what was occurring unknowingly blocked the armed robbers ' vehicles . A gunman pulled the woman from her vehicle , beat her , and took off for the French border . The other gunmen followed into France , which is only about 100 meters ( yards ) from the casino , Gill said . There were about 600 people in the casino at the time of the robbery . There were no serious injuries , although one guest on the Casino floor was kicked in the head by one of the robbers when he moved , the police officer said . Swiss authorities are working closely with French authorities , Gill said . The robbers spoke French and drove vehicles with French license plates . CNN 's Andreena Narayan contributed to this report .
Dressed in black clothes and black ski masks , ten men raided Grand Casino Basel . Part of group failed to break into casino vault on the lower level . They were caught by police who opened fire with a machine gun. One woman was beaten by robbers after unknowingly blocking their vehicles with car .