Afghanistan President Hamid Karzai accused "enemies" of the good relationship between Afghanistan and India, one of Afghanistan's staunchest allies. "

KARACHI, Pakistan (CNN) -- Karachi police have detained four suspects in connection with a series of blasts that injured dozens of people in the city's Pashto neighborhoods, a senior police officer told CNN on Tuesday. "We have got some clues (from) motorcycles and from the cars that were stolen and later on used in the blast(s)," Wasim Ahmed said. "We have some leads from that, and we have rounded up some suspected persons from it." Karachi -- Pakistan's largest and most populous city -- remains on high alert after at least five bombs exploded within 30 minutes of each other Monday in western Karachi. About 40 people were wounded. Initial reports of one fatality turned out to be inaccurate, a police source said. Most of those injured were treated and released, Sindh Home Minister Zulfiqar Mirza said Tuesday. Five or six of the injured were hospitalized, he said. Army rangers and police personnel remain stationed throughout the port city, according to Sindh Province police. Karachi is the capital of Sindh Province. Provincial, local and federal investigators are trying to determine who is responsible for the bombings, which took place in neighborhoods populated mostly by Pakistanis from the northern and tribal areas of Pakistan.