Officials said the wife and daughter of a police inspector were arrested on suspicion of gunning down Isabel Carrasco, conservative leader yesterday of the provincial council in Leon, northern Spain.
Police put a white sheet over Carrasco's body as it lay on a pedestrian bridge above the Bernesga River in the northern university city.
Police rolled it away on a stretcher and began dusting the bridge for fingerprints, an AFP photographer saw.
Officials said an assailant fired several bullets at Carrasco in the late afternoon. The two woman were arrested shortly afterwards and police are investigating whether they killed the politician.
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"It seems that the daughter was fired yesterday from the council where she worked as an engineer," an interior ministry spokesman told AFP.
"For that reason, everything indicates that it was personal vengeance," he said.
"The police are carrying out tests to find out who fired the shots," he added. "The gun has not been found."
"We thought it was firecrackers. At that time the place was full of people, children playing, people walking their dogs," he told the online edition of daily newspaper El Pais.
The national government delegate in the Castilla y Leon region, Ramiro Ruiz Medrano, called it "a tragic act without explanation" and said Carrasco was not known to have received any threats.
He said the two women were "the wife and daughter of a police inspector".