Fears London riots will spread based on forensics of Duggan death (VIDEO)

Police and community leaders fear the London riots may spread now that an initial inquiry revealed that a handgun found at the scene of the police shooting that killed Mark Duggan — the man whose death sparked the London riots — had not been fired.

Further, the Independent Police Complaints Commission found that a CO19 firearms officer fired two bullets during an attempt to arrest Duggan late last week, and that a bullet that lodged in a police radio was "consistent with being fired from a police gun," the Guardian reports.

Police fired twice at Duggan, with the first bullet killing him and the second bullet passing through his body to hit an officer's radio, sources told The Australian newspaper. Duggan, 29, was armed when Metropolitan Police officers stopped him in a London cab but he did not fire the weapon, the paper reported.

Meanwhile, a post-mortem examination on Duggan has revealed that he died of a single gunshot wound to the chest.

The Metropolitan Police have launched a "major investigation" into the riots, which began Saturday in Tottenham, North London, but have since spread to Birmingham, Bristol and Liverpool, resulting in the death of at least one man, widespread looting and the reported arrest of 525 people.

(GlobalPost reports: Why London exploded last night; London riots cause first fatality)

Parts of London resembled a war zone on Tuesday: a third night of violence left shops looted, century-old businesses burned to the ground and streets littered with barricades.

(GlobalPost photo gallery: London on fire: violent riots spread)

Prime Minister David Cameron cut short his Italian vacation and recalled Parliament from its summer break. Cameron told reporters outside his Downing Street office that the House of Commons would hold a one-day emergency session on Aug. 11, Bloomberg reports, adding that:

Police leave has been canceled and Metropolitan Police Deputy Assistant Commissioner Stephen Kavanagh said the London force is preparing for "mass disorder again tonight."

Some 16,000 police officers are reportedly now policing London's streets in a bid to prevent a fourth night of rioting.

Not before a deliberately lit fire razed the Sony warehouse in Enfield, North London, that contained the stock on numerous independent record labels to be distributed by the Pias Group, the Guardian reports. 

Labels that may be affected reportedly include 4AD, Warp and Beggars Banquet.

The Australian reported that the firearms officers at the scene of Duggan's death had never claimed they were fired upon, but the officer who shot Duggan believed his life was in danger.

Duggan, a father-of-four, was reportedly shot by police during an attempted arrest in Ferry Lane, Tottenham Hale on Thursday by Metropolitan Police officers working for Operation Trident, which investigates gun crime in the black community, the BBC reports.

Duggan has been described by police as an "important player" in the criminal underworld of the Broadwater Farm estate in Tottenham. Insiders have said the Met team sent after him were expecting to "confront an armed man."

In the area he was known by the moniker Starrish Mark. The word Starrish denoted his membership of a notorious violent crew called The Star Gang, the Daily Telegraph reported.

But Duggan's partner, Semone Wilson, has told Britain's Channel 4 that she is "100 percent sure" that he did not fire at police before he was killed.

"They portray Mark as a gangster but he's not known to any gangsters or gangs — don't get me wrong he's well known, very popular, but he's not a gangster he's a loving caring guy."

A peaceful protest by his family and friends outside Tottenham police station on Saturday was followed by a riot in the area and disorder and looting later spread across London.

Fears remain that rioters will take to the streets with even more force now that it's been found that Duggan did not fire his weapon during the attempted arrest.

Three shots were reportedly fired on the scene, where a bullet was found lodged in a police radio, and a non-police gun was discovered at the scene.