All government agencies and offices were closed Wednesday in Tehran, and in 13 provinces, including some along the western and eastern borders, hours for government offices were limited to 6 a.m. to 10 a.m.

Iran also issued a notice to civilian aviation, warning that “gunfire will take place” for several hours on Wednesday night and into Thursday over parts of the country.

As Iran prepares to follow through on its vow to “severely punish” Israel for assassinating the Hamas leader Ismail Haniyeh in Tehran last week, it is raising war jitters among the public. Yet, there are few if any signs on the streets of Tehran and other cities that a conflict may be looming.

The government said that the shutdown Wednesday reason was merely because of extreme heat (the temperature in Tehran was expected to reach 108 on Wednesday), and that the closures of airspace were for military exercises.

But the explanations belie the statements from officials that, as the acting foreign minister, Ali Bagheri, told state media on Tuesday, “Iran’s response will be definitive and severe.”

While the time and scope of Iran’s response remains unclear — whether it will act alone or in coordination with regional militias like Hezbollah in Lebanon and the Houthis in Yemen — the disconnect between the escalating rhetoric and the nonchalance about preparing the public is striking.