Meaning of ALARM in English
BAD : Finally we got really worried and alarmed the local police.
GOOD : Finally we got really worried and alerted the local police.
alarm = make someone feel worried about a possible danger: 'We don't wish to alarm people unnecessarily, but it would be wise to avoid drinking the tap water here.'
alert = inform someone of possible danger so that they can be ready to deal with it: 'When the pilot realized that one engine had failed, he alerted air traffic control.'
Longman Common Errors English vocabulary. Английский словарь распространенных ошибок Longman. 2012