Traces of asbestos found inside Madison Square Garden has prompted officials to shut down the iconic arena and postpone Tuesday night’s New York Knicks’ game.

Crews discovered the dangerous substance in the arena’s attic above the ceiling, hours after overnight maintenance was conducted.

Madison Square Garden officials issued a statement saying crews were working around the clock to make the venue safe for reopening.

“We will be working with the city and independent experts, ATC Associates and GCI Environmental Advisory, to evaluate and determine the most appropriate course of action. As the safety of our customers and employees are our top priority, we will not reopen the Garden until we are absolutely assured the Arena is safe.”

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(Source: WPIX)