Raymond Davis was arrested after shooting two Pakistanis in what he called self defense during an armed robbery attempt and what Lahore's police chief called "clear-cut murder".
The United States is piling pressure on Pakistan to release Davis, saying his arrest was a violation of international conventions because he has diplomatic immunity.
Pakistan says the matter will be decided by its courts.
The issue has become a lightning rod for anti-American sentiment in Pakistan, which the United States counts as an important, if unreliable, ally in its war against militants that launch attacks against its soldiers in Afghanistan.
Jamaat-e-Islami, a religious and political party capable of organizing large protests, accused the United States of exerting "unprincipled and unlawful" pressure on Pakistan.
"Why is America hell bent on trampling on Pakistani law and its judicial system? We will forcefully protest if he is released without a court order," Jamaat-e-Islami deputy chief Liaquat Baluch told Reuters.
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