Authorities said they have uncovered “a sophisticated bomb-manufacturing facility” after it raided a warehouse in a residential district.

Bahrain’s Interior Ministry said it has seized 1.5 tonnes of high-grade explosives after it raided a warehouse in a residential district.

A statement by the ministry said they have uncovered “a sophisticated bomb-manufacturing facility that contained in excess of 1.5 tonnes of high-grade explosives, including C4-RDX, TNT, and other powerful chemical explosives in a counter-terrorism operation at a warehouse in the Nuwaidrat residential district.”

Authorities said they have arrested a number of individuals suspected of being responsible for assembling and concealing explosives on suspicion of having “terror” links with Iran and the Iraq-based militant group Hezbollah.

Chief of Police Major-General Tariq Al Hasan said: “This significant discovery marks yet another disturbing incident in which relentless Iranian actions are attempting to undermine security and stability within Bahrain and the wider region,” as quoted by the Bahraini state news agency.

“The sophistication of terrorist-related incidents in Bahrain have increased markedly during 2015, and the professionalism with which these materials are manufactured, concealed, and deployed is a clear indication of international support and sponsorship.”

In August, the Bahraini Interior Ministry arrested five individuals suspected of conducting a bomb attack in Bahrain.

It said they were connected, funded and trained by Iran’s Revolutionary Guard and a militant group “Hezbollah Brigades” in Iraq.