The attack was carried out in a university gymnasium in Marawi, a city in the south of the country besieged by Islamist militants for five months in 2017.
He appeared at London's Old Bailey by video link form prison and pleaded guilty to two terrorism fundraising charges and possession of a firearm for terrorist purposes.
In addition to detaining 10 people with alleged Islamic State links, Turkish authorities discovered explosive gels, materials used to make explosives, as well as weapons and ammunition.
Formerly united against Islamic State, the Kurdish-led SDF and the Military Council supported by Arab tribal leaders have been fighting for several weeks.
Mozambique's President Filipe Nyusi told a news conference on Friday that Omar had been killed on Tuesday, but cautioned that the fight against the insurgency was not over.
After an attack on Iran's Parliament in 2017 which also targeted an important shrine, militants have targeted a similar site again
Islamic State, which operates sleeper cells in lands it once ruled, claimed responsibility for the attack in a statement on its Telegram channel.
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