OAKLAND (AP) — A child, not the grizzly bears, cracked a glass viewing window at the Oakland Zoo’s bear exhibit, and officials say there’s no need to fear the bears will get out.

Oakland Zoo spokeswoman Erin Harrison said in a statement Tuesday that a child hit a rock against the glass several times, “shattering the laminate layer.”

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She says the bulletproof-strength glass at the enclosure where four grizzly bears live is made of six separate panes, each an inch (2.5 centimeters) thick.

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She says another zoo visitor reported the child to staff, but they couldn’t find the family.

Harrison says a replacement glass plane will cost $67,000 and require specialty equipment to install next month.

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