ISIS has claimed responsibility for Wednesday's terror attack at the Bardo Museum in Tunisia that killed at least 23 people, including two attackers. They warned, the attack was just the "first drop of the rain."

In a three-minute audio message, the terror group identified the two gunmen killed in the siege as Abu Zakaria al-Tunisi and Abu Anas al-Tunisi.  The ISIS said both men "were heavily equipped with machine guns and hand grenades" and were sent to target the Bardo Museum. The group threatened that more attacks will follow.

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"You will not enjoy security nor be pleased with peace while the Islamic State has men like these who do not sleep amidst grievances," the message said.

ISIS even branded the terrorist attack as a blessed operation that led to the death of many innocent civilians and wounding dozens. The group also called Tunisian authorities a failure.

The audio message is now being examined by U.S. authorities to determine its authenticity.

The ISIS' claim comes hours after authorities arrested nine people involved in the attack, in what was considered as the deadliest since the 2011 revolution.

Tunisian President Beji Caid Essebsi said four of those arrested on Thursday were believed to have direct links to operations on Wednesday's attack, while five others were suspected of having ties to the group. 

On Wednesday, Tunisian President Beji Caid Essebsi delivered a speech on television, declaring war with terror.  Essebsi described the attackers that stormed the National Bardo Museum as "savage minority groups".

"I want the people of Tunisia to understand firstly and lastly that we are in a war with terror, and these savage minority groups will not frighten us," said Essebsi as he spoke to the nation on television.

The deadly attack began when gunmen clad in military uniforms stormed the Bardo museum on Wednesday and opened fire on tourists getting off the buses.

 "I couldn't see anything except blood and the dead," a driver of a tourist coach said. 

The 23 people killed included 18 foreigners form Japan, Italy, Colombia, France, Poland, Spain, Belgium and the United Kingdom.  The other five dead were Tunisians, including the two gunmen.

Forty four people were wounded in the attack - eight of whom have been given medical attention and were released. 

While a thorough investigation is underway, families from at least eight countries are grieving, and the Tunisian tourism industry is left in disarray.

TagsTunisia, bardo museum, museum attack, ISIS