In certain situations, there may be an urgent need to disseminate alerts without the support of communication infrastructure. For example, when a disaster like an earthquake strikes, it may cause the loss of cellular coverage, Wi-Fi hotspots, etc. In this and similar application scenarios, last mile connectivity will be needed for prompt delivery of alerts. Nearly everyone nowadays carry a smart device that is equipped with at least three communication options that do not need any infrastructure, namely, Bluetooth, Wi-Fi Ad-hoc, and Wi-Fi Direct. Despite their ability to work without infrastructure, all these options need a connection setup phase before starting data dissemination. The setup phase incurs unneeded overhead and delay, which diminish their utility in delivering time-critical data. In this paper, we propose a protocol that uses the service discovery mechanism in Wi-Fi Direct to addresses these shortcomings. The protocol embeds the alert data to be disseminated in a Wi-Fi Direct service discovery frame and stores it locally. Other devices interested in receiving alerts send service discovery requests to get updates. The protocol also takes care of forwarding the received alerts to other devices as well. The evaluations showed that the proposed protocol is capable of transmitting timely alerts.