DOHA (AFP) - Al-Jazeera slammed as "unjust" an Egyptian court decision on Monday to jail three of its journalists for between seven and 10 years after convicting them of aiding the blacklisted Muslim Brotherhood.

"We condemn... this kind of unjust verdict," network chief Mustafa Sawaq told the satellite news channel after a Cairo court jailed the three in a case that has caused international outrage.

"We are shocked," he said, charging that evidence provided by the prosecution "was not enough to jail someone for a single day".

Mr Sawaq also said the journalists had been working openly with "nothing disguised" about their output which was broadcast openly on the Al-Jazeera English channel.

Australian Peter Greste and Egyptian-Canadian Mohamed Fadel Fahmy were sentenced to seven years, while producer Baher Mohamed received two sentences - one for seven years and another for three years.

Nine other defendants tried in absentia, including three foreign journalists, were sentenced to 10 years, while two defendants were acquitted.

Since the Egyptian army ousted Islamist president Mohamed Mursi in July last year, the authorities have been incensed by the Qatari network's coverage of their deadly crackdown on his supporters.

They consider Al-Jazeera to be the voice of Qatar, and accuse Doha of backing Mursi's Brotherhood, while the emirate openly denounces the repression of the Islamist movement's supporters which has killed more than 1,400 people.