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Al Qaeda May Have Developed New Liquid Explosive: Report

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According to senior U.S. government officials, al-Qaeda operatives may have developed a new kind of undetectable liquid bomb. Officials told ABC News the new technique consists of dipping clothes into a liquid that would make the textile explosive upon drying.

"It's ingenious," one official told the network.

According to ABC, the new technique was developed by Ibrahim al-Asiri, al-Qaeda's bomb maker in Yemen.

As the Atlantic Wire notes, the Saudi terrorist is believed to have designed the devices used by "Christmas Bomber" Umar Farouk Abdulmutallab on a flight to Detroit and during an attempt to assassinate Saudi Arabia's deputy interior minister.

"He's a very dangerous individual - clearly somebody who has a fair amount of training and experience," John Brennan said of al-Asiri in 2010, the BBC reports.

The Transportation Security Administration declined to comment on the report.

On Tuesday, the U.S. State Department ordered all non-essential personnel at its embassy in Yemen to leave the country. Earlier this week, the department closed 19 diplomatic posts and issued a worldwide travel alert for U.S. citizens over fears of a terror attack.

The New York Times reported the alert was prompted by communications between the head of al-Qaeda, Ayman al-Zawahiri, and the organization's Yemeni branch in which al-Zawahiri ordered the affiliate to carry out an attack. The newspaper notes that direct communication between al-Zawahiri and an affiliate over specific attacks is highly unusual.

Take a look at the map below to find out which U.S. embassies have been closed:

View Closed U.S. Embassies in a larger map