A new app is meant to make reporting suspicious activity easier. Above, the Empire State building and the skyline of Manhattan are viewed from one of the top floors of the newly built Four Seasons private residences at 30 Park Place, Jan. 21, 2015 in New York. Spencer Platt/Getty Images

A new phone app is meant to make it simpler for New Yorkers and visitors to the city to report suspicious activities on their smartphones, Gov. Andrew Cuomo announced Monday. The app is free and is part of a new “See Something, Send Something” campaign encouraging New Yorkers to alert the authorities of potential threats.

"These new efforts are essential pieces in our fight against terrorism," Cuomo said. "We have stepped up our preparedness in the aftermath of the Paris attacks, and we continue to remain vigilant against those who seek to spread fear and violence. Despite the tremendous pain and loss that terrorist attacks around the world have caused the people of this state, the family of New York stands stronger than ever before."

The app is downloadable for free on iPhones and Androids, and users simply send a photo of whatever it is that they consider suspicious or send a written message. The app also includes information on what New Yorkers and visitors to the state should be keeping their eyes open for and when to report suspicious activity. Similar services are available in several other states, and the governor's office said the app is not meant as an alternative to calling 911 for immediate threats or emergencies.

Cuomo also announced that the Metropolitan Transportation Authority will hire 46 more officers trained in counterterrorism for Grand Central Terminal, Penn Station and throughout the Metro-North Railroad, Long Island Rail Road and Staten Island Railway systems.

New York has been on increased alert since supporters of the so-called Islamic State group launched coordinated attacks in Paris this month, killing at least 130 people. Militants released a video Wednesday making threats against New York, featuring old footage of Times Square. The New York City Police Department determined there was no credible or specific threat against the city, but the city deployed members of a new anti-terrorism squad as a precaution.

"The people of New York City will not be intimidated," Mayor Bill de Blasio said late Wednesday. "We understand it is the goal of terrorists to intimidate and disrupt our democratic society. We will not submit to their wishes."