Qatar summoned Iran's deputy ambassador over an attack on a Qatari tanker in the Strait of Hormuz, demanding an immediate halt to security threats and disruption of navigation.

The reported development is consistent with multiple reports today, although there is an important clarification:

Most verified reports say Qatar summoned Iran's ambassador (or the senior Iranian diplomatic representative in Doha), while some reports describe the official as the deputy ambassador depending on the circumstances and diplomatic representation. 

What happened?

After a Qatari LNG tanker, Al Rekayyat, was struck near the Strait of Hormuz, Qatar accused Iran of responsibility and lodged a formal diplomatic protest. The Qatari Foreign Ministry:

Summoned Iran's senior diplomatic representative in Doha.

Condemned the attack as a serious violation of international law.

Demanded that Iran immediately stop actions threatening regional security and freedom of navigation.

Said Iran bears full legal responsibility for the attack and any resulting damage. 

Why is this significant?

The Strait of Hormuz is one of the world's most important maritime chokepoints, with roughly one-fifth of global oil and a significant share of LNG exports passing through it. Any attack on commercial shipping there raises concerns over:

Global energy supplies.

Oil and gas prices.

Maritime security.

Regional tensions between Iran and Gulf states. 

Iran's position

As of the latest reports, Iran has not formally accepted responsibility for the attack. Iranian state media suggested the tanker ignored warnings while transiting the area, but Tehran has not officially claimed carrying out the strike. 

Bottom line: Qatar has formally protested to Iran, demanded an immediate end to threats against international shipping, and holds Tehran legally responsible for the attack on its LNG tanker near the Strait of Hormuz. Iran, however, has not officially acknowledged responsibility.