LONDON -- The Israel Defense Forces and Israeli Security Agency said Thursday they are "checking the possibility" that Hamas leader Yahya Sinwar was among three people killed in the Gaza Strip.

"At this stage, the identity of the terrorists cannot be confirmed," the IDF wrote in a post to X. "In the building where the terrorists were eliminated, there were no signs of the presence of hostages in the area. The forces that are operating in the area are continuing to operate with the required caution."

The 62-year-old has served as Hamas' leader in Gaza since 2017 and assumed leadership of the group's Political Bureau after the assassination of Ismail Haniyeh in Iran in July.

This is a developing story. Please check back for updates.

ABC News' Guy Davies contributed to this report.