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(CNN) — Japan deployed missile-defense systems at three sites around Tokyo early Tuesday ahead of a possible missile launch by North Korea, Chief Cabinet Secretary Yoshihide Suga said.

The Patriot missile batteries were set up in the central district of Ichigaya and in the suburbs of Asaka and Narashino, Suga told reporters Tuesday. The deployments come as U.S. and South Korean officials warn Pyongyang could be preparing for another provocative move after weeks of belligerent rhetoric.

Monday, Suga had said the government would not publicize any missile-defense deployment, saying “It would show our strategy to North Korea.”