Newark Airport was reopened and flights were resumed after about an hour, officials said.

Newark has intersecting runways, so when passengers have to evacuate and are on the runways, they have to close everything down, resulting in major delays. This caused at least 20 diversions early Saturday morning, according to Flightradar24. The FAA reported that there was a ground stop in place for flights into Newark originating from most parts of the country while the airport was closed.

The Air Transat pilot reported smoke coming from the cargo, according to LIVEATC.NET.

There are rules about what goes into the cargo hold because if something catches fire there, it's difficult to extinguish. But if something catches fire up in the cabin, it can typically be put out quickly and safely.

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