(CNN) -- A Pakistani court has ordered a jailed American diplomat to remain in custody for 14 more days, authorities said Friday. The man's lawyer then filed a petition calling for his immediate release, saying he is covered under diplomatic immunity. 
 
 Raymond Davis, who allegedly shot and killed two men, was transferred from police custody to "judicial remand," said Munir Ahmed Khan, a member of the police investigative team. 
 
 Pakistani law says police can only keep a suspect in custody for 14 days. After that, a judge can either release the suspect -- on bail or for lack of evidence -- or transfer him to judicial custody, which is usually a prison instead of a police station lock-up. 
 
 Davis said he was attacked by the two men on January 27 who tried to rob him as he drove through a busy Lahore neighborhood, according to the U.S. Embassy in Pakistan. 
 
 The U.S. State Department has demanded that Davis be freed. 
 
 Under international agreements, people carrying diplomatic passports are granted diplomatic immunity, the department said. 
 
 Davis' lawyer filed a petition Friday, challenging the court's jurisdiction over the case. A judge will hear arguments on February 25. 
 
 The United States says Davis was assigned to the U.S. Embassy in Islamabad but was working at the U.S. Consulate in Lahore at the time of the shootings. 
 
 Lahore Police Chief Aslam Tareen rejected Davis' claim that he shot the men in self-defense. 
 
 "It was clear cut murder," Tareen told reporters. 
 
 Witnesses told police that Davis kept firing even when one of the men was running away, Tareen said. 
 
 "It means he wanted to ensure that that they were killed," he said. 
 
 He acknowledged the two men shot were armed, and that one of them pointed his gun at Davis -- but didn't shoot. 
 
 "All the bullets were in their chamber," he said. 
 
 The detention has strained relations between the United States and Pakistan. 
 
 Secretary of State Hillary Clinton, according to the State Department, has raised the issue with Pakistani officials. And the U.S. ambassador to Pakistan, Cameron Munter, has met with Pakistani President Asif Ali Zardari on the issue. 
 
 Members of Congress told senior Pakistani leaders that billions of dollars of U.S. aid are in jeopardy unless Davis is released. 
 
 "We indicated it could very well be" that the United States might consider withholding funding, Rep. Howard "Buck" McKeon, R-California, said Tuesday after returning to Washington from meetings in Pakistan and Afghanistan. 
 
 McKeon said he and two other congressmen on the trip had frank conversations with Pakistani Prime Minister Yousaf Raza Gillani and other senior officials about Davis. 
 
 "It is entirely possible that a member of Congress would come down and offer an amendment to cut funding for Pakistan, based on their detaining Mr. Davis, and my guess is there would be a lot support for such an amendment, frankly because of the outrage of detaining an American with diplomatic immunity," said Rep. John Klein, R-Minnesota. 
 
 The U.S. spent more than $1.5 billion in non-military aid to Pakistan in fiscal year 2010. 
 
 The case has sparked some protest and fueled anti-American feelings in Pakistan. 
 
 During several protests last week, hard-line clerics condemned the shootings and demanded the government not release Davis to the U.S. government. 
 
 Local television showed a rally in Karachi where protesters re-enacted their version of the shooting. Men wearing smiling masks and holding toy guns played the part of Davis and gleefully danced around several protesters, who pretended to be the shooting victims. 
 
 CNN's Jill Dougherty and Charley Keyes and Journalist Nasir Habib contributed to this report. ||||| LAHORE, Pakistan — The wife of a Pakistani man shot and killed by a U.S. official committed suicide by eating rat poison Sunday, explaining before she died that she was driven to act by fears the American would be freed without trial, a doctor said. 
 
 The U.S. has demanded Pakistani authorities release the American, saying he shot and killed two armed men in self-defense when they attempted to rob him as he drove his car in the eastern city of Lahore. He was arrested on Jan. 27, and the U.S. has said he has diplomatic immunity and is being illegally detained. 
 
 The shootings have stoked anti-American sentiment in Pakistan, feelings that could be further inflamed by Shumaila Kanwal's suicide. She died several hours after being rushed to a hospital, said Ali Naqi, the doctor in Faisalabad city who treated her. 
 
 "I do not expect any justice from this government," said Kanwal in a statement recorded by the doctor before she died. "That is why I want to kill myself." 
 
 Kanwal also spoke to reporters after arriving at the hospital, saying "I want blood for blood." 
 
 "The way my husband was shot, his killer should be shot in the same fashion," she said. 
 
 The case puts Pakistan's government in a difficult position. The government relies on the U.S. for billions of dollars in aid but is wary of being seen as doing Washington's bidding. The U.S. is widely unpopular in Pakistan, in part because of its undeclared campaign of drone missile strikes along the northwest border with Afghanistan. 
 
 The government could face charges of being an American lackey if it hands Raymond Davis over to the United States. But refusing to do so risks harming a relationship with a vital ally. 
 
 Pakistani officials have avoided definitive statements on Davis' level of diplomatic clearance and whether he qualifies for immunity. 
 
 Federal officials have said the decision on his fate is up to courts in Punjab province, where the shootings occurred. But provincial officials have said the federal government must decide whether Davis has immunity. The two governments are controlled by rival political parties, which has further complicated the case. 
 
 Besides the two men who were shot dead, a bystander was also killed when he was struck by an American car rushing to the scene to help Davis. Police have said they want to question the Americans suspected in that death as well. 
 
 Relatives of the men who were allegedly shot by Davis have participated in several protests in Lahore, including one Thursday outside the U.S. consulate where demonstrators shouted "Hang the American killer!" 
 
 Some commentators have tried to paint the two men as innocent Pakistanis rather than thieves who were attempting to rob Davis. But the U.S. Embassy has said the men had criminal backgrounds and had robbed money and valuables at gunpoint from a Pakistani citizen in the same area minutes before the shootings. 
 
 ___ 
 
 Associated Press writer Asif Shahzad contributed to this report from Islamabad.
– A Pakistani court has ruled that an American diplomat who allegedly shot and killed two men he says tried to rob him must remain in custody for 14 more days, CNN reports. Raymond Davis’ lawyer quickly filed a petition for his release, holding that he has diplomatic immunity. Davis has been transferred from police custody to “judicial remand”—which usually means prison. A hearing is scheduled for Feb. 25. The US has called for his release, and American officials have threatened to cut aid to Pakistan over the matter. Meanwhile, a Pakistani police chief called Davis’ actions “clear-cut murder.” He said witnesses reported that Davis continued firing at the men as one ran away. He admits that the men were armed, and that one pointed a gun at Davis, but says they didn’t fire. (For one of the dead men's wives, a tragic end; click for that story.)