The city's launching its first ever cyber security initiative.

Mayor Bill de Blasio says it will come in the form of a smartphone app.

It will alert users alert users if there's suspicious cyber activity on their device.

The mayor says the goal is to help better protect public Wi-Fi networks.

"There's many positive things we could say about the flow of information and the freedom of information, but we all know that a host of dangers have been created as well. We have to deal with those realities and it's become clearer and clearer in recent weeks, the whole nation now looking more deeply at the question of the sanctity of our own data," De Blasio said.

The free NYC Secure app will be available to all New Yorkers starting this summer.