Some shipowners are opting to steer clear of the strategically important Strait of Hormuz, according to the world’s largest shipping association, reflecting a growing sense of industry unease as the Israel-Iran conflict rages on.

Israel’s surprise attack on Iran’s military and nuclear infrastructure on Friday has been followed by four days of escalating warfare between the regional foes.

That has prompted shipowners to exercise an extra degree of caution in both the Red Sea and the Strait of Hormuz, a critical gateway to the world’s oil industry — and a vital entry point for container ships calling at Dubai’s massive Jebel Ali Port.

Jakob Larsen, head of security at Bimco, which represents global shipowners, said the Israel-Iran conflict seems to be escalating, causing concerns in the shipowner community and prompting a “modest drop” in the number of ships sailing through the area.

Bimco, which typically doesn’t encourage vessels to stay away from certain areas, said the situation has introduced an element of uncertainty.