Washington: A self-professed Daesh supporter in the US state of Florida was charged with attempting to set off a backpack bomb, the FBI said.

Harlem Suarez, 23, from Key West, Florida drew authorities’ attention because of his extremist Facebook posts, the FBI said Tuesday.

A user of the social site contacted the police after Suarez allegedly tried to recruit them to support Daesh, according to the government’s criminal complaint.

“I’m gonna do the backpack...that’s for sure I’m gonna do the backpack,” Suarez allegedly told the cooperator in apparent reference to a backpack bomb that had been discussed earlier.

Suarez later allegedly paid a cooperator to construct a telephone-controlled bomb.

The complaint said Suarez intended bury the bomb on the beach and detonate it.

“I just call and the thing is gonna, is gonna make... a real hard noise from nowhere,” he allegedly said by phone.

The FBI said Suarez listed his Facebook “likes” as “Jihadist,” “Extraordinary Prayer for ISIS,” and “Prayers for ISIS: Weapons of our Warfare.”

Suarez had also placed an online order for an AK-47 rifle, the FBI said.

The Syria and Iraq based radical group Daesh has inspired a number of supporters across the world and raised the threat of lone-wolf attacks.

Suarez allegedly said he attempted to contact Daesh in Syria but never got a response, according to the complaint.

After Suarez made his first court appearance on Tuesday in Miami, his temporary attorney, Richard Della Fera, said in an email that Suarez “may be a troubled and confused young man but he is certainly not a terrorist.”

“He comes from a very good, hard-working family that arrived here from Cuba in 2004 because they yearned for freedom. They raised their son to love this country,” Della Fera said.

Suarez is being held without bail pending a detention hearing next week.

Authorities say Suarez came to the FBI’s attention through his Facebook posts praising the Daesh group and containing extremist rhetoric.

In April, Suarez allegedly posted, “Be a warrior, learn how to cut your enemies head and then burn down the body learn how to be the new future of the world Caliphate” - a reference to Daesh’s goal of building a regional fundamentalist entity.

The FBI says he later added a request “from any brother. How to make a bomb send me a video or something, what do I need to make it.”

The complaint says Suarez told an FBI informant he wanted to make a timer bomb, bury it on a Key West beach and detonate it remotely. Suarez was arrested on Monday after taking possession of an inert explosive device provided by an FBI informant. Suarez had given the informant some bomb supplies, including two boxes of galvanized nails, the backpack and a cellphone to be used as a detonator, according to the complaint.

“I can go to the beach at the night time, put the thing in the sand, cover it up, so the next day I just call and the thing is gonna, is gonna make, a real hard noise from nowhere,” Suarez told an FBI source in a recorded call, according to the complaint.

Suarez was being monitored for months by US authorities and never made an actual explosive, and there was no indication in the FBI complaint that he had contact with any Daesh militants overseas. Still, Miami’s FBI special agent in charge, George Piro, said the alleged threats had to be taken seriously.

“There is no room for failure when it comes to investigating the potential use of a weapon of mass destruction,” Piro said.

Among other things, the FBI says Suarez also sought to make a Daesh recruitment video using a script he wrote himself. It eventually was made under FBI surveillance at a motel in Homestead, according to the complaint, with Suarez dressed in a black tactical vest, black shirt, mask and yellow-and-black scarf.

“American soil is the past, we will destroy America and divide it in two, we will rais(e) our black flag on top of your white house and any president on duty (cut head),” Suarez says in a script for the video.

The FBI says Suarez also ordered an AK-47 assault rifle on the Internet and intended to have it delivered to a Key West pawn shop. Although he could legally purchase the weapon, the FBI says, Suarez incorrectly filled out paperwork and it was returned to the seller.

Several dozen people have been charged in the US with attempting to fight alongside Daesh and other militants or with lending them material support.