According to initial reports, the parish priest in the southern city of Algeciras is among the injured and in serious condition.
The Spanish charity Proactiva Open Arms rescued more than 300 migrants off the coast of Libya and is now docked in the port of Crinavis, in San Roque. It was earlier denied by EU states.
Major shipping companies are diverting cargoes in a bid to avoid Spain's ports which face industrial action over unions' attempts to secure some 6,000 jobs threatened by easier hiring practises.
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