TEL AVIV, Israel — Seven oil tankers caught fire or were damaged in the Strait of Hormuz overnight after being hit by Iran or striking naval mines, Tehran said Thursday, a markedly high number as tensions rise over concerns about a return to all-out war.

With days before a close election in Israel in which Prime Minister Benjamin Netanyahu could lose power, and before next month’s U.S. midterm election in which war-linked high prices have sparked voter anger, there are concerns that U.S.-Israeli attacks on Iran could resume.

“Netanyahu wants to attack Iran, that’s not even a question,” Danny Citrinowicz, a researcher at Israel’s Institute for National Security Studies and a former Iran specialist in Israel’s military and intelligence services, told The Associated Press.

He accused Israel of rushing into another round with Iran without revamping its strategy. A clear Netanyahu victory in the Oct.…