PARIS (AP) — French police used water cannons on Tuesday to disperse projectile-throwing protesters blocking a key fuel depot on the Mediterranean, as gasoline shortages spread around the country amid increasingly tense labor actions. A two-month protest movement against a bill weakening France's famed worker protections reached a new level this week as fuel industry workers joined in — and it's now posing the biggest challenge yet to President Francois Hollande and his government. The junior minister for transport, Alain Vidalies, said on i-Tele television that 20 percent of gas stations around the country are facing shortages as of Tuesday morning and unions are threatening to stop production at all of France's eight refineries.