TAIPEI (Taiwan News) — The Ministry of National Defense said it had tracked 16 aircraft and four ships from China’s military around the country by 5 p.m. Saturday (Sept. 24).

One unmanned drone and two planes entered the southwest sector of Taiwan’s air defense identification zone (ADIZ), the ministry tweeted. The drone was a Harbin BZK-005, while the two planes were a Shaanxi Y-8 anti-submarine aircraft and a Shaanxi Y-8 reconnaissance plane.

As a regular response, Taiwan’s military tasked aircraft and naval vessels, deployed land-based air defense missile systems to monitor and respond to the Chinese activities, and issued radio warnings.