583
North Korea , which is seeking a guarantee from the United States that it won ' t be attacked , ratcheted up the threat of conflict in a statement issued by its official Korean Central News Agency accusing Washington of escalating tensions .
 attack: attacked
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: declare bankruptcy, transfer ownership, marry, die, phone write, arrest jail, convict, sue, transfer money, end organization, start organization, end position, merge organization, start position, transport, charge indict, elect, attack, injure, born, extradite, release parole, sentence, demonstrate, meet, trial hearing, divorce, nominate, fine, appeal, pardon, execute, acquit 
Text: {0} 
Answer:
 attack: attacked