Iran’s military denied Tuesday that it fired missiles at Israel hours after a ceasefire was supposed to begin, Iranian state television reported.

The report quoted the general staff of Iran’s armed forces, which includes its regular military and its paramilitary Revolutionary Guard, as making the denial.

Israel reported missile fire some two and a half hours after the ceasefire began. Israeli officials have ordered a strike on Iran in response, though there’s no immediate report of an attack there.

Explosions boomed and sirens sounded across northern Israel midmorning on Tuesday, after both Israel and Iran on Tuesday accepted the ceasefire plan to end the 12-day war roiling the Middle East.

Israeli Defense Minister Israel Katz called the missiles a violation of the ceasefire and instructed Israel’s military to resume ‘‘the intense operations to attack Tehran and to destroy targets of the regime and terror infrastructure.’’

The shaky agreement was announced early Tuesday morning after Tehran launched a retaliatory limited missile attack on a U.S. military base in Qatar on Monday.

Between U.S. President Donald Trump’s post and the start of the ceasefire, Israel launched a blitz of airstrikes targeting sites across Iran before dawn and Iran replied with an onslaught of missiles that killed at least four people in Israel early Tuesday morning.

Israel said it had intercepted the midmorning barrage of missiles that came hours into the truce.

‘‘Tehran will tremble’’ Israel’s Finance Minister Betzalel Smotrich wrote on X after the missiles were launched.

- Agencies