Las Vegas shooter Stephen Paddock had the same type of explosive compound in his car and house that is thought to have been used in last year's bombing of Chelsea, Manhattan.

Paddock, who killed 58 people and wounded hundreds in Sunday's massacre, had 50 pounds of Tannerite in the car he parked outside the Mandalay Bay hotel.

He also had an unknown quantity of the substance - most commonly used by marksmen as an exploding target - at his home in Mesquite.

Paddock also had fertilizer that can be used as an explosive alongside an armory of 49 guns - with 23 of them in his hotel room alone.

In 2016, 31 people were hurt in New York City and New Jersey when three bombs - suspected to have been planted by al-Qaeda-inspired Afghan migrant Ahmad Khan Rahim - exploded. Tannerite residue was found at the site of one of the explosions - in Chelsea, Manhattan (pictured)

Paddock had a room full of guns in his home at Mesquite, Nevada (pictured), police said after raiding it on Monday

These photos from inside Paddock's room at the Mandalay Bay show several assault rifles. Beside one pillar (right), a neat stack of magazines can be seen

In 2016, 31 people were hurt in New York City and New Jersey when three bombs - suspected to have been planted by al-Qaeda-inspired Afghan migrant Ahmad Khan Rahim - were detonated.

Tannerite residue was found at the site of one of the explosions - in Chelsea, Manhattan - as reported by the Scientific American.

There has been no word from police about why Paddock had Tannerite - which is a patented, legal product.

Cops had to use special robots search Paddock's Mesquite home the day after his rampage in Vegas.

They found a huge stockpile of ammunition, guns and explosive compounds.

He is believed to have had an arsenal of at least 49 weapons - including the 23 he took into the Mandalay Bay so he could murder dozens of people enjoying the Route 91 Harvest festival nearby.

Paddock's hotel room was filled with guns, many with bump-stocks that would allow for automatic rates of fire. This was the scene after cops busted open his door to find him dead. He killed 58 people and wounded 489 others at Sunday's festival

Investigators are still processing the festival site-turned-crime scene. The FBI warned in the press conference on Wednesday that it would be some time before all of the evidence that was being collected was properly examined

Paddock (pictured) also had fertilizer that can be used as an explosive alongside an armory of weapons that included 23 guns in the hotel room alone

Among his weapons were four DDM4 rifles, three FN-15 rifles, at least one AK-47 assault rifle and at least one Colt AR-15 assault rifle.

The fertilizer found in his car was ammonium nitrate - a notorious bomb-making ingredient favored by terrorists groups like the IRA and al-Qaeda.

It was also used by Oklahoma City bomber Timothy McVey.