Buying in bulk due to fear rising from the Middle East conflict

Q: With the recent conflict in the Middle East, we are bound to be worried. Recently, the President of Brazil had called out to the the President of South Africa stating that we should be prepared and ready as our country is at a risk of getting invaded. 

Some Ulama have called out in the Western Cape saying that we should stock up and store goods. 

My question is, is it permissible to buy in bulk and store items?

Imaam pausing in the middle of the khutbah to make an announcement

Q: During the Jumu'ah Khutbah (the second Khutbah) the Imaam stopped in the middle of the Khutbah and made an announcement saying "whilst the Khutbah is on we are not allowed to talk". 

1. What is the ruling, will this nullify the Khutbah or not? 

2. What is the ruling with regarding to stopping the Khutbah to make an announcement? 

3. Will the Jumu'ah have to be made Qadha of?