The New York Stock Exchange suffered its biggest outage in more than 10 years on Wednesday when an unspecified technical glitch forced a 3.5-hour long suspension of trading.

The cause of the problem was not immediately disclosed, but the exchange quickly ruled out a cyberattack.

Problems began during the morning and at 11:32am EDT the NYSE halted all trading to prevent the effects of the “internal technical issue” from affecting the overall market.

“NYSE has temporarily suspended trading in all symbols,” the market said in a message to traders. “All open orders will be cancelled.”

Updates for the public were few and far between during the duration of the outage, although the NYSE was said to be in constant contact with the Treasury Department and the Securities and Exchange Commission.

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