The Spanish report in which Spanish government sources accuse the CIA said:
At least two of the 10 assailants who broke into the embassy and interrogated diplomatic staff have been identified and have connections to the US intelligence agency. The CIA has denied any involvement but government sources say their response was "unconvincing."
That the CIA is the main suspect in the assault was reported on Wednesday in the Spanish mainstream paper El Pais. The paper made the extra effort to publish an abbreviated English language version. It was widely picked up by other international outlets. Some of the assailants were Asian and spoke Korean language. They were probably from the South Korean National Intelligence Service (NIS), a subsidiary of the CIA know for its extremely hawkish politics. It often rigs elections in South Korea in support of hawkish conservatives candidates.
Attacking a foreign embassy in a third country is far out of bounce of international law and diplomatic decency. After the El Pais report something had to be done to direct the attention away from the CIA and to find some other culprit.