ISLAMABAD (Reuters) - Police have arrested two more suspects involved in the planning of an attack on the Indian city of Mumbai last November, bringing the number in custody to seven, a state-run news agency reported after a court hearing on Saturday. The two arrested men were identified as Jameel Ahmed and Younus Anjum in APPs report. A US Embassy spokesman said US officials had not sought permission to attend the trial as observers. US nationals were among those killed during the three-day killing spree in Mumbai. Meanwhile, a veil of secrecy was kept over court proceedings on Saturday in the case against five militants accused of planning attacks on the Indian city of Mumbai that killed 166 people last November. The court convened in camera at a jail in Rawalpindi and lawyers were under instruction not to discuss the case. Todays hearing has ended but we cant share any details with you; we have been barred from divulging any details of the trial, one of the lawyers told journalists as he left the jail. He refused to be identified. Lawyers even refused to say when the next hearing would take place, and it was unclear whether the hearings were still in the pre-trial phase. Citing excerpts from an earlier order by the courts judge, a private television channel said proceedings were being held in camera for the protection of the judge, lawyers and witnesses and keeping in view the security and national interest. A US Embassy spokesman said US officials had not sought permission to attend the trial as observers. US nationals were among those killed during the militants three-day killing spree in Mumbai. The suspects on trial at Adiala Jail are Zaki-ur-Rehman Lakhvi, a commander of the Lashkar-e-Taiba, and four others: Hammad Amin, Abdul Wajid alias Zarar Shah, Mazhar Iqbal alias Abu al Qama and Shahid Jameel Riaz.