An Australian environmental protester, Natalie Lowrey, is still in Malaysian police custody after taking part in a protest to stop a rare earths processing plant in the country's east. Fifteen Malaysian citizens were detained during the demonstration on Sunday, but all have been released on bail and due to report back to police on July 21. Ms Lowrey has not been granted bail and a court date has not been set. An estimated 1,000 people turned up to blockade the entrance of the controversial Lynas rare earths processing plant in Gebeng, Kuantan in a fresh bid to have it shut down. The rally was led by Malaysian movement Himpunan Hijau, who have the backing of the opposition coalition, Pakatan Rakyat. Australian anti-mines campaigner, Tully McIntyre, who's in Kuantan, said Ms Lowrey was arrested around 4pm on Sunday and is being held in Kuantan Police Station. "Natalie is feeling okay, but is extremely concerned about what is happening and unsure of how long she will be detained or how long investigations will take," Ms McIntyre said. "She is currently being housed in a room with 20 other female prisoners and has been unable to sleep on a concrete bench under fluorescent lights with 24/7 camera surveillance." Ms McIntyre said two protesters were hurt in the demonstration. The Lynas plant began operations in January 2013 after delays due to strong opposition from local residents and green groups, who fear radioactive contamination. Ms McIntyre said protesters want the plant closed. "There's massive opposition against the plant. It's been one of the largest environmental movements in Malaysian history and protests will continue," she said. Lynas' two-year operating licence for the plant is due for renewal in September. UPDATE 30/06/2014: Natalie Lowry was released and returned to Australia. UPDATE 8 July 2014: All 15 activists have been charged. Ten were charged under Section 145 of the Penal Code for unlawful assembly (Himpunan Hijau leader Wong Tack, Chong Kong Yuen, Raymond Ng Abdullah, Hew Kuan Yau, Thomas Wang, Ta Weng Seng, Rapar Ahmad, Lee Khai Ming, Tan Chee Hooi and Zamri Zonal). The remaining five (Phua Kia Yaw, Ho Kam Huat, Foong Poh Choo, Wong Chee Wai and Wong Chee Wen) were charged under Section 147, for rioting. Convictions for both charges carry a two-year jail term, a fine, or both. The court also issued two new bail conditions for the 15: they must report to police once a month and are forbidden from discussing the trial on social media.