Jewish tombstones
Jewish tombstonesAryieh King

Jewish tombstones were recently discovered in Poland's Vistula River, amid a prolonged drought that has seen water levels sink to record lows, the Associated Press has reported. 

"The Vistula River is hiding no end of secrets. They are everywhere," said Jonny Daniels, the founder and director of Jewish foundation "From the Depths."

The Jewish tombstones, discovered along the river's banks in Warsaw, are believe to have come from the Brodno cemetery, located n Warsaw's Praga district. 

Once the final resting place of 300,000 Jews, only 3,000 graves remain in Brodno today. The remaining tombstones were ransacked during and after World War II and used as building materials or to reinforce the river's banks.

The tombstones were discovered two weeks ago, when a man walking along the Vistula saw fragments of stones with Hebrew lettering. 

On Tuesday, the man brought Daniels, who waded into the water and collected the fragments, to the spot.  

The head of "From the Depths" told AP that he hopes to bring students to the riverbed for a more thorough search and return anything that is found to the Brodno cemetery. 

"Jewish history is buried in the Vistula," Daniels said.