The commander of Iran’s Islamic Revolutionary Guards Corps Hossein Salami on Wednesday threatened retaliation after an alleged Israeli strike killed an Iranian adviser in Aleppo, Syria, earlier this week.

In comments made the day after IRGC adviser Saeed Abyar was buried in Tehran, Salami was quoted by Iranian outlets warning that Israel would “pay for the bloodshed.”

According to The New York Times, Abyar was in the IRGC’s expeditionary Quds Force and had been stationed in Syria since 2012. The Britain-based Syrian Observatory for Human Rights said that 16 other members of pro-Iran groups were killed in the strike, which the war monitor attributed to Israel, “including Syrian and foreign fighters.”