Paris - Several home-made explosive devices were found early on Wednesday in front of a Paris police station, police sources said.

According to first reports, the devices were bottles filled with an unknown flammable liquid and furnished with a fuse.

They were placed on a car-towing crane in front of a police station at the edge of the Montmartre district, one of the city's most popular tourist destinations.

Police described the devices as "very crude". An investigation has been opened.