Pakistan, Sept. 10 -- Iran said on Wednesday it had attacked 10 ships near the Strait of Hormuz after the US sank five Iranian oil tankers, in the biggest declared wave of tit-for-tat attacks on shipping by both sides since the start of the six-month-old war.

The attacks sent the price of oil surging, with benchmark Brent crude futures breaching $100 a barrel for the first time since July. At least one seafarer aboard a tanker was reported killed and another listed as missing.

Iran also said it had fired ballistic missiles at a base used by US forces in Jordan. Attacks by both sides since the end of August have shattered a month of relative calm, with the US and Iran hitting military, shipping and energy assets.

The Revolutionary Guard...