Lassana Bathily, a Muslim employee at Paris Kosher grocery store Hyper Cacher, saved several people by hiding them in a walk-in freezer when a gunman laid siege to his workplace on Friday.

Amedy Coulibaly burst into the market and opened fire, killing 4 people. He took several shoppers hostage and threatened to kill them if police stormed the printing shop where Cherif and Said Kouachi, who killed 12 people in an attack on the satirical magazine Charlie Hebdo earlier in the week, were holed up in a village to the north.

Bathily, identified by French media as a Malian Muslim, helped several customers to safety as the chaos unfolded. “I went down to the freezer, I opened the door, there were several people who went in with me. I turned off the light and the freezer,” Bathily, 24, told French network BFMTV. “I brought them inside and I told them to stay calm here, I’m going to go out. When they got out, they thanked me.”

It’s unclear exactly how many people Bathily managed to hide inside the freezer in the store’s basement. City councillor Malik Yettou said that six people and a baby escaped the gunman by hiding there, while BFMTV put the number at about 15.

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