Osama Bin Laden's grandson 'was killed in an air strike on the Afghanistan-Pakistan border'

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Osama bin Hamza bin Laden (pictured), the  12-year-old grandson of 9/11 mastermind Osama Bin Laden was killed in an airstrike, it has been claimed

The 12-year-old grandson of 9/11 mastermind Osama Bin Laden was killed in an airstrike, it has been claimed.

The child, named Osama like his terrorist grandfather, is believed to have died along the Afghanistan-Pakistan border last year.

He was praised for his 'martyrdom' by father Hamza Bin Laden, who jihadis have hailed as the 'heir' to the leadership of al-Qaeda.

A letter written by Hamza, whose father was shot dead by a US Navy Seal team in 2011, mourned the death of the 'hero cub' and described his eldest son as 'the grandson of bravery' - adding that he liked to play-act scenes of martyrdom. 

Further details of his death - including the location of the apparent airstrike - were revealed by the Pan-Arab news website Arabi 21, which cited jihadi sources. But there have been conflicting reports, with some saying he died of illness.

The note called 'Letter From Sheikh Mujahid Hamza Bin Laden', was published by Al-Qaeda's propaganda arm, the Global Islamic Media Front, along with a picture image of a young Osama and addressed to the Bin Laden family.

It said: 'We console ourselves and you on the martyrdom on the hero cub... the grandson of bravery... our son Osama, may Allah have mercy on him.' 

The note says that young Osama often play-acted scenes of martyrdom while playing with other children - but it is not known where he lived.

In November, Osama bin Laden's 'favourite' son called on Muslims around the world to launch terror attacks on the US for killing his father. 

The child, also named Osama, was praised for his 'martyrdom' by his father Hamza Bin Laden (pictured), who jihadis have hailed as the 'heir' to the leadership of al-Qaeda 

A letter written by Hamza, whose father Osama Bin Laden (pictured) was shot dead by a US Navy Seal team in 2011, mourned the death of the 'hero cub' and described his eldest son as 'the grandson of bravery' - adding that he liked to play-act scenes of martyrdom

In an audio message, Hamza bin Laden, believed to be around 28, urged Muslims to 'to take revenge on the Americans, the murderers of the Shaykh [Osama bin Laden], specifically on those who participated in this heinous crime.'

It came just days after Hamza's wedding video was released, showing the 'Crown Prince of Terror' as an adult for the first time. 

This was released by the CIA as part of a trove of material recovered during the May 2011 raid that killed the terror group leader at his compound in Pakistan.

Until then, the public had only seen childhood photos of Hamza, which have been used as propaganda tools by al Qaeda. It's believed the militants have not released pictures of him as an adult for his own safety. 

In recent years, he has emerged as the heir to his father's throne and become a prominent member of the terrorist organization.

In November, Osama bin Laden's 'favourite' son Hamza (pictured as a child) called on Muslims around the world to launch terror attacks on the US for killing his father

Dubbed the 'Crown Prince of Terror', he has purportedly called for terrorist attacks on London, Washington and Paris in an audio message released by Al Qaeda. 

In January of this year, he was officially designated a terrorist by the United States.

The U.S. State Department added him, to its list of global terrorists after confirming he had followed in his father's footsteps to join al Qaeda.

Al Qaeda senior leader Ayman al-Zawahiri released a tape in August 2015, claiming that Hamza had joined the group. In the audio message, Hamza himself spoke and called for lone wolf attacks. 

The Al Qaeda leadership believes there is huge propaganda value in invoking the bin Laden name because it allows them to stake their claim to be the legitimate representative of jihad in the Middle East.

In recent years Al Qaeda and its Syrian affiliate, Jabhat al Nusra, have lost territory and fighters to the more dominant ISIS during a long-running mutually destructive conflict. Al Qaeda has also lost key leaders as a result of ISIS assassinations and Coalition bombings.