By Daniel Hunter

US protests by fast food workers over wages expanded into 190 cities on Thursdays as the movement reached its two-year anniversary.

The country's fast food workers have been campaigning for two years for an increase in minimum wage to $15 (£9.57). It has achieved modest success in that time, with the minimum wage in San Francisco and Seattle being raised.

Federal minimum wage in the US is $7.25 - roughly £4.64.

The "Fight for 15" campaign, which is backed by President Barrack Obama, has organised eight protests and walk-outs over the last two years, but said Thursday's action would be the biggest yet.

Protesters have targeted the likes of McDonalds, Burger King and other fast food chains, but have also campaigned for politicians to put minimum wage on the agenda during election season.

McDonalds said the protests don't necessarily represent the opinions of all of its employees. It also stressed that wage decisions are down to the individual franchise owners.

"It's important to know approximately 90% of our US restaurants are independently owned and operated by franchisees who set wages according to job level and local and federal laws," it said in a statement.

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