Two brothers who shared extreme material with one another and "adopted the ideology" of terrorist organisation so-called Islamic State, have been jailed.

Safaan Ali was just 16 when he started attempting to radicalise his older brother, Mohammed Shehzad, 21, Leeds Crown Court heard on Friday.

Prosecutors said that as part of his campaign, the younger defendant sent his brother an English transcript of a "call to arms" from Abu Bakr al-Baghdadi, once the leader of Islamic State (IS), in which the extremist says: "Terrify the enemies of Allah and seek death in the places you expect to find it."

Ali, now 18, downloaded what a judge described as "chilling documents speaking about the killing of innocent people".

These included volumes of the IS magazine Rumiyah, one of which gave instructions on how to carry out vehicle attacks similar to that in Nice on Bastille Day 2016, which cost more than 80 lives, the court heard.

Other documents possessed by the teenager included one on the best way to carry out knife attacks, another on "target locations" for large-scale attacks, and various explosives guides, prosecutors said.

The court heard how, as Ali sent more content to Shehzad, the older brother started to adopt the extremist ideology.

In April, father-of-two Shehzad sent Ali a video of al-Baghdadi - who died last month - reading documents, with music playing in the background, the court heard.

Some of the lyrics included: "Our swords are shining, our tunes are the cannons."

Shehzad, of Upper Woodlands Road, Girlington, Bradford, admitted a single charge of disseminating terrorist publications, while Ali, of Fairbank Road, also Girlington, Bradford, pleaded guilty to one count of the same offence and eight of possessing material likely to be useful to a person committing or preparing an act of terrorism.

On Friday, Shehzad was given a 15-month sentence, while Ali was handed three and a half years in jail.

Sentencing them, Judge Tom Bayliss QC said: "Both of you have the ability, should you choose, to become law-abiding members of the community.

"But instead, regrettably, you have adopted the ideology espoused by the terrorist organisation known as Islamic State.

"Those who commit terrorist offences and those who involve themselves in terrorism, even to the extent that you have, must expect severe sentences."

Prosecutor Denise Breen-Lawton said the offending started in October 2017, when Ali began sending Shehzad IS-inspired material to "educate him".

The court heard how Ali told his brother "it is better to live one day as a lion than 100 years as a sheep" during their text conversations, with Shehzad developing more of an interest in the ideology over time.

Ms Breen-Lawton said that Ali was "technically and forensically aware" of the need to cover his tracks, and attempted to use encryption techniques to hide conversations with his sibling.

The court heard how, following their arrests on the morning of July 3, both defendants were interviewed by police.

Ali was seen "smirking and smiling" when asked whether he had committed offences under terrorism legislation, and told officers that Sharia law should be a worldwide religion, the court heard.

But he later said that the documents had been downloaded to his phone automatically, and that he had not taken in their contents.

Meanwhile, Shehzad said in his own interview that he follows his religion to the letter, and that he believes adulterers should be stoned and that LGBT people should not be given rights.

It was argued in court on his behalf that he had been "reckless" when communicating with his younger brother.

Following the sentencing, Detective Chief Superintendent Martin Snowden, from Counter Terrorism Policing North East, said the defendants' actions showed they were "encouraging support for violent radical terrorism".

He added: "Whilst the brothers' offences were not themselves acts of violence towards others, they show their concerning mindset and aspiration to encourage others to share their beliefs."