At Adolfo Suarez Madrid-Barajas airport in the Spanish capital, a 'hidden city' of the homeless has been allowed to balloon over the past 10 years.

Urgent action is being demanded as the homelessness situation at a number of popular Spanish holiday airports, including Mallorca and the Costa del Sol, reaches crisis point.

At Adolfo Suarez Madrid-Barajas airport in the Spanish capital, a 'hidden city' of the homeless has been allowed to balloon over the past 10 years.