2 detained after gas canisters found near Paris’ Notre Dame

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A French soldiers patrol by Notre Dame in Paris as part of the Sentinelle military force security mission while people queue for the mass for the feast of the Assumption on August 15, 2016. -- ALAIN JOCARD/AFP/Getty Images)

PARIS  — Police officials say a terrorism investigation is underway after a car parked near Notre Dame Cathedral in Paris was found with seven gas canisters inside.

Police said Wednesday that the car discovered Sunday morning along the Seine River with its hazard lights on had no license plates and no one inside. Six canisters filled with gas were found in the trunk and an empty one in the car.

An official says the couple that owned the car has been taken into custody.

France is on alert after a string of Islamic State attacks and threats against landmarks.

Gas canisters filled with nails were used in attacks on Paris in the 1990s by Algeria-linked extremists.