"There is no way that Iran would do a one-sided implementation of the agreement," Zarif said.
Police are trying to locate the suspect, who is believed to have fled after a customer grabbed his gun.
Another 112 people were wounded, according to public health officials.
While many evangelical Christians dismiss climate change as major concern, some scripture-citing environmentalists within their churches are on a mission.
People most affected by HIV won't be able to come, groups complain.