Agents from the US Federal Bureau of Investigation (FBI) Wednesday gave evidence at the trial of the sole surviving gunman of the deadly Mumbai attacks. The first witness, an FBI electronic engineer and forensic expert, told a special prison court that he had examined one satellite phone and three global positioning systems recovered after the attacks. The downloaded data from the devices showed a number of maps and routes, including one from off the coast of Pakistan to Mumbai, the FBI agent told the court, under condition of anonymity. “This route starts in the ocean near the Gulf of Karachi and it goes to Mumbai. The route was stored by the user,” he added. Other locations found on the GPS system included areas of the cities of Karachi and Rawalpindi and of Mumbai. The ten gunmen, who attacked Mumbai last November, killing 166 people and wounding more than 300 others, are said by the prosecution to have come to the city via the sea. The surviving gunman, Mohammed Ajmal Kasab, and an accomplice are alleged to have committed the bloodiest episode in the 60-hour reign of terror, opening fire with AK-47 assault rifles and throwing grenades at commuters at the city's main railway station. Kasab is being tried on a string of charges, including waging war against India, murder and attempted murder. He faces the death penalty if convicted. Meanwhile, a top US diplomat said that ensuring justice in last November's Mumbai attack is a “high priority” for President Obama and the United States would keep pressing Pakistan for action against its planners. The comments by Timothy Roemer, the new US ambassador to India, are the strongest remark from the United States in recent months as India complains of slow progress by Pakistan in punishing those behind the attack. India blames Pakistan-based militants for the raid that killed 166 people and renewed tensions between the nuclear-armed South Asian rivals. New Delhi said it was halting a 2004 peace process until Pakistan closed down “terrorist networks” on its soil. “The Al-Qaeda, the Taleban, Lashkar-e-Taiba ... we have a common enemy with India. And we are pressing Pakistan hard on the Mumbai suspects,” said Roemer, who served on the commission to investigate the Sept. 11 attacks on the United States. “So this is a high priority for the president (Obama) and a high priority for the government to work with India on these efforts and to bring the perpetrators of this brutal attack, this blood-thirsty attack on Mumbai to justice.”