Australian journalist Peter Greste will spend the next 15 days detained in Egypt and being questioned over alleged ties to terrorists.
The award-winning Al Jazeera reporter was arrested in a Cairo hotel on Sunday along with two colleagues, bureau chief Mohamed Adel Fahmy and producer Baher Mohamed.
Cameraman Mohamed Fawzi was also arrested but has since been released.
Egyptian authorities are accusing the crew of holding illegal meetings with members of the Muslim Brotherhood, which has been declared a terrorist group by the military-installed government.
It is now a crime in Egypt to be a member of the Islamist group or to be in possession of its literature.
Prosecutors are accusing Greste and his colleagues of "disturbing public security" and broadcasting "live news harming domestic security".
They were found in possession of Muslim Brotherhood "publications" such as maps of Egyptian military installations, the interior ministry said.
The team was also accused of producing work for Al Jazeera despite the fact the broadcaster's licence has been cancelled by authorities.
It is not clear if all of the detained journalists are facing the same accusations.
If charges are brought, the journalists could be brought to trial and have their 15-day detention period extended.
Foreign Affairs Minister Julie Bishop says the Australian Government is doing all it can to help Greste.
"Officials in Cairo have been contacted and they are providing direct consular assistance to him," she said.
"I don't believe it would assist him if I went into anymore details at this stage but we are working directly with him and providing consular support."
Greste is an award-winning journalist who joined Al Jazeera English after working with CNN and BBC.
He won the prestigious Peabody award in 2011 for a documentary on Somalia.
Al Jazeera says accusations 'false and unfounded'
Al Jazeera has expressed anger at the crew's detention and treatment by Egyptian authorities.
"It is outrageous to be treating bone fide journalists in this way," said Al Jazeera English managing director Al Anstey.
"The allegations that are being made are totally false and unfounded. We operate in Egypt legally."
Qatar, which hosts and funds Al Jazeera, was a big supporter of former Egyptian president Mohamed Morsi before he was overthrown by the army last year.
The broadcaster has been an outspoken critic of the military-installed interim government.
Mr Anstey said the team had "huge experience carrying out the highest quality journalism with integrity" and were working on stories showing the situation in Egypt.
The Committee to Protect Journalists, a press freedom group, said Egypt came third for the number of journalists killed on the job in 2013 after Syria and Iraq.
"Amid stark political polarisation and related street violence, things deteriorated dramatically for journalists in Egypt, where six journalists were killed for their work in 2013," the committee said.
