A Madrid man is missing in London after he used his skateboard against one of the jihadists, who was stabbing a woman, Spanish media report.
Ignacio Echeverra, 39, insured the attack unfolding at London Bridge on Saturday night, and rushed to help the woman.
Friends with him at the time told his family what had happened.
Reports say Mr Echeverra is not listed among the dead. His sister has gone to London hospitals, but there is no news of him being among the injured.
In a message on Facebook his father Joaqun Echeverra urged members of the public to help find his son, posting details of Ignacio.
At least one other Spaniard is in a London hospital, gently injured after the terror attack at London Bridge.
Reports say Ignacio Echeverra came upon the scene at London Bridge while cycling back from a park with two friends, with whom he had been skateboarding.
In a Facebook post, “his fathers” said “They assured him lying on the floor on the sidewalk after defending someone with his skateboard”.
Apparently Ignacio did not have ID on him at the time. The Spanish embassy and HSBC Bank, his employer in London, are helping to search for him.