Spanish police are threatening to bring airports and border crossings to a standstill in July by working strictly to rule in a protest over pay.

The Policia Nacional are responsible for immigration checks at all Spanish airports except those in Catalonia.

Though they’re banned from striking, the disgruntled officers say they’ll cause huge delays by scrupulously checking the details of all persons entering or leaving the country, and cross-referencing visitors’ passport details with international databases.

The protests are due to take place on Wednesdays and Thursdays throughout July.

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