A new eyewitness who was working in the WTC on 9/11 has gone on record to describe how he heard multiple grenade-like explosions around the basement levels of the north tower, backing up William Rodriguez' story, the WTC janitor who reported explosions before the first plane hit the tower.

Anthony Saltalamacia was a morning supervisor who managed over a hundred workers in the twin towers. He worked closely with WTC janitor William Rodriguez, eyewitness to sub-level explosions that occurred before the impact of the first plane in the north tower and representative for many 9/11 victim's families.

Saltalamacchia was in sub-basement B1 of the North Tower, approximately 1,100 feet below the airplane's impact point at floors 93 to 98.

In the the following You Tube video, Saltalamacia discusses what he witnessed on 9/11. The account backs up the events previously described by William Rodriguez.

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"The explosion....at first we believe it came from the mechanical room and then we heard a series of other explosions that sounded up on the above levels of the building," said Saltalamacia.

Saltalamacia then discusses how a man ran into the office with his skin hanging off. William Rodriguez had previously described the same scenario following basement level explosions and it was also seconded by another eyewitness, Kenneth Johannemann, an employee of ABM janitorial services.

"As we're standing there, more explosions were happening," said Saltalamacia, before he urged Rodriguez and the other workers to leave the building. The group left and initially headed towards the lobby before they realized it too had been partially destroyed.

Despite Saltalamacia's plea to stay out of harm's way, Rodriguez ran back into the burning building in an attempt to save his colleagues.

"The amount of explosions I heard from 8:46 to the time we got out was so many - at least ten - it was just like multiple explosions to where I felt there was different grenades, that's what it sounded like, like different grenades being set off in the building," said Saltalamacia.

"It was one major explosion and then there was different explosions throughout that period of time until we got out," he added.

Numerous other WTC basement workers, including Felipe David and Salvatore Giambanco, have also gone public with eyewitness testimony concerning massive sub-level explosions that took place before Flight 11 hit the north tower.

WTC construction worker Phillip Morelli was headed for level B-4 in Tower One [north tower], four stories below ground, when he was thrown to the floor by a violent explosion that coincided with the plane hitting 100 floors above.

15-year WTC worker Marlene Cruz told Peter Jennings in an interview with ABC News that she was also rocked by an explosion in the basement level of the north tower.

The 9/11 Commission completely ignored the hundreds of survivors, professionals, first responders, firefighters and police who reported numerous secondary explosions at all levels of the twin towers.

In his video interview, Saltalamacia concluded by dismissing the official story of 9/11 as a "cover-up" and urged a proper investigation to find out the truth behind what he and others witnessed that day.