Husnain Rashid, of Nelson, Lancashire, provided an “e-toolkit for terrorism” in a “prolific” online channel he ran named the Lone Mujahid, Woolwich Crown Court was told on Wednesday.
The 32-year-old, who has been employed as a teacher at the Muhammadi mosque, also called for ice creams to be poisoned and for the four-year-old prince to be targeted at Thomas’s school in Battersea, south-west London, jurors heard.
Rashid is charged with encouraging terrorism by posting a photograph of the prince, along with the address of the four-year-old’s school, a silhouette of a jihad fighter and the message: “Even the royal family will not be left alone”.
Prosecutor Annabel Darlow said: “His proposals were indiscriminate and made no distinction between adult and child, between members of fighting forces and civilians.
“His suggestions included injecting poison into supermarket ice creams and targeting Prince George at his first school.”
Other targets included the Halloween Parade in New York and railway stations in Australia, Darlow said.
Rashid specialised in supporting lone attackers, providing assistance with “every conceivable type of attack”, including the use of bombs, chemicals and knives, she added.
He also communicated with a British terrorist in Syria named Omar Ali Hussain, advising him on how to make successful attacks including bringing down aircraft with lasers, Darlow told the court.
She said Rashid published his own magazine targeting lone wolves, distributed al-Qaida terror magazine Inspire and wanted to travel to Syria to fight in Isis territories.
“He made numerous posts glorifying terrorist atrocities committed successfully against others and encouraging and inciting his readers to plan and commit more successful terror attacks of their own,” Darlow said.
When police swooped on his house, she said, Rashid “hurled” a phone containing a “treasure trove” of evidence over a wall and into an alleyway.
The phone revealed that he had been using Telegram, the social messaging app, to take part in thousands of chats, the prosecutor said.
Rashid is also accused of posting a photograph of the Burmese ambassador to the UK and saying ” You know what to do”, urging others to “fight and spill the blood to the apes in your land” and calling for others to “start preparing tools and weapons/explosives”.
Rashid has denied three counts of engaging in conduct in preparation of terrorist acts, one count of encouraging terrorism, two of dissemination of a terrorist publication and one of failing to comply with a notice under the Regulation of Investigatory Powers Act.
The allegations span a period between October 2016 and April this year.
The trial, expected to last six weeks, continues.