India said it had called in the Iranian envoy to New Delhi and flagged its "deep concern" over the attack on two Indian-flagged ships attempting to cross the Strait of Hormuz on Saturday (Apr 18).

One of the vessels attacked was identified as the Sanmar Herald, an Indian government source said.

The crew on board and the vessel were safe, the source said.

India's top foreign ministry official asked the Iranian ambassador to convey India's view to Iranian authorities and resume at the earliest the process of facilitating India-bound ships across the Strait, a statement from the ministry said.

The ambassador said he would convey these views to Iranian authorities, the statement said.

On Saturday, Iran reversed its decision to reopen the Strait of Hormuz and fired on tankers attempting to pass through the waterway on Saturday (Apr 18).

It also warned that it would continue to block transit through the strait as long as the US blockade of Iranian ports remains in effect.

Iran’s joint military command said on Saturday that “control of the Strait of Hormuz has returned to its previous state ... under strict management and control of the armed forces.”

Two gunboats from Iran’s Revolutionary Guard opened fire on one tanker transiting the Strait of Hormuz, the British military’s United Kingdom Maritime Trade Operations centre said.

TankerTrackers.com reported vessels were forced to turn around in the strait, including an Indian-flagged super tanker, after they were fired on by Iran.