A method for transmitting alert messages relating to a crowd gathering to one or more user devices in a communication network comprising the steps of receiving data from one or more data sources at a central alert system, wherein said data comprises the geo-location of the crowd gathering; classifying the crowd gathering based on processing the received data on one or more pre-determined criteria stored in the central alert system; identifying the geo-location of one or more user devices in proximity to the identified geo-location of the crowd gathering; generating an alert message based on the classification of the crowd gathering; and transmitting the generated alert messages to the one or more user devices.