FILE -Police officers stand on patrol at a Metro station outside the Louvre museum near where a soldier opened fire after he was attacked in Paris, Feb. 3, 2017.
FILE -Police officers stand on patrol at a Metro station outside the Louvre museum near where a soldier opened fire after he was attacked in Paris, Feb. 3, 2017.

PARIS - France is increasing security at public transport locations in Paris after an explosion killed at least nine people in a St. Petersburg metro tunnel on Monday, the Interior Ministry said.

"Following the events in the St. Petersburg metro, and as a precautionary measure, Interior Minister Matthias Fekl has decided to redeploy security means in public transport across the Paris region," the ministry said in a statement.

"Amid an extremely high terrorism threat, the government continues to take measures to protect the French people."