Spain on Thursday sought to calm a bitter row with Venezuela over Caracas' alleged involvement in plots by Colombian and Basque guerrillas to assassinate the Colombian president. A Spanish judge on Monday charged that the Basque separatist group ETA and Colombia's FARC rebels plotted to kill Colombian politicians in Spain, including President Alvaro Uribe, with Venezuelan 'governmental cooperation'. Spanish Prime Minister Jose Luis Rodriguez Zapatero then demanded an 'explanation' from Caracas. Venezuelan President Hugo Chavez on Wednesday dismissed the Spanish accusations, saying he had 'nothing to explain'. But Foreign Minister Miguel Angel Moratinos said he had told Chavez in a telephone call on Monday that Madrid was not seeking an 'explanation' on the allegations but only 'information'. 'They (Caracas) have denied all type of involvement and have promised to cooperate' with Spanish authorities, he told reporters on Thursday. 