570
The company declined to name the companies involved in the crackdown but said that the update will block ads from a ' small number of sites with persistent abusive problems ' .
 patch vulnerability: will block
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 patch vulnerability: will block