Prayer: Is āyāt prayer wajib only for those in the city of the event, or for anyone who learns about it?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: Is āyāt prayer wajib only for those in the city of the event, or for anyone who learns about it?

English:

Question #709:

Is the obligation of āyāt prayer limited to those who are in the city of occurrence of the phenomenon, or does it apply to any mukallaf who comes to know about it without being in that city?

Answer #709:

It is obligatory only for those who are in the phenomenon’s city at the time of its happening.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer