No evidence so far, except that an Iranian blew his legs in Thailand today. This brings the issue of retaliations; it's probably harder for Iran to kill Israeli scientists on their own soil. I do not know if someone in Iran supported the attack on an Israeli diplomat in India, but accounting for the risk of injuring bystanders and destroying the relations with a country that import 500 k bpd of crude oil, this would be much more absurd than if a similar attack took place in Georgia or Azerbaijan since they are already hostile to Iran.