NEW YORK (CBSNewYork) — The Reptile House at the Bronx Zoo was closed Saturday after an adolescent Egyptian cobra went missing from an off-exhibit enclosure.

Zoo staff said they immediately closed and secured the building after learning the snake was missing. Egyptian cobras are poisonous.

READ MORE: New York Weather: CBS2's 7/31 Saturday Morning Forecast

Officials at the zoo said they were confident that the snake, about 20-inches long, was confined to an isolated, non-public area of the building. Snakes typically seek closed-in spaces, and are uncomfortable in open areas.

READ MORE: New York City Rolls Out $100 Incentive For Getting Vaccinated As CDC Report Warns Delta Variant As Contagious As Chicken Pox

“We are informing the public out of an abundance of caution, and will continue to take whatever steps necessary to ensure public safety,” the zoo said in a statement.

MORE NEWS: Iconic Fireplace Restaurant In Paramus, New Jersey Announces Sudden Closure After 65 Years

The Reptile House will be closed indefinitely, zoo staff said.