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Hamburg airport security staff to strike

A woman waits as passengers queue at the security check at the airport in Hamburg, Germany, Thursday, Feb. 14, 2013. Hundreds of flights have been canceled after security personnel walked off the job at two German airports in a dispute over wages. Security workers at Duesseldorf and Hamburg airports started the one-day warning strike at 4 a.m. Thursday after wage negotiations failed to make any progress. (AP Photo/dpa, Malte Christians)

BERLIN (AP) -- A German union has called on security workers at Hamburg airport to walk off the job on Wednesday, the latest in a series of strikes staged to ramp up pressure in a pay dispute.

The ver.di union said Tuesday that security personnel will strike from 3:45 a.m. to 11 p.m. (02:45 to 22:00 GMT).

Workers at the Hamburg, Duesseldorf and Cologne-Bonn airports recently have staged several so-called "warning strikes," which are used regularly as a tactic to increase pressure in German wage negotiations. Hamburg was hit by a two-day walkout last week that caused dozens of flight cancelations.

The union and private security companies that employ the workers have failed to narrow differences over demands for a pay increase.