A petition calling for the release of four journalists who have been detained in Libya for three weeks, including a London-based photographer, has received more than 30,000 signatures

According to a Facebook page London-based South African photographer Anton Hammerl was captured in Libya on 5 April, along with US journalists James Foley and Clare Gillis, and Spanish photographer Manu Brabo.

Foley, a correspondent for GlobalPost, was able to make a call to his mother on Saturday, letting her know he was not injured and was being treated well, GlobalPost reported yesterday.

"Foley told his mother that he was in a Tripoli detention centre together with Brabo. Foley, a fluent Spanish speaker, said the two spoke often.

"Foley told his mother that he had also grown close to Gillis but that she had been transferred to another facility.

"The Spanish news agency that Brabo had been working for reported that he also had been allowed to make a phone call home."

The Mail & Guardian online reported this weekend that both the South African government and Austrian government had "received simultaneous confirmation" that Hammerl was alive and well.

Last week two western journalists were killed while reporting on the conflict in Libya, identified as British-born photojournalist Tim Hetherington and US photographer Chris Hondros.

Another British photographer also injured in the same attack, Guy Martin, was evacuated on Sunday to Malta, the BJP reported.

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