A 15-year-old boy has been arrested in Paris suspected of preparing imminent "violent action," two judicial sources said, the second alleged plot with links to the Islamic State group discovered in France over the last week.

Last Sunday, a car loaded with gas cylinders was found near Notre Dame cathedral and jerrycans of diesel, leading to the discovery of a plot to attack a Paris railway station under the direction of the Islamic State group. Seven people, including four women, were arrested.

The boy had been under house arrest since France declared a state emergency after Nov. 13 attacks in Paris in which Islamic State militants killed 130 people, two sources said on condition of anonymity. They did not say why he was under house arrest.