Jamaat-i-Islami, a hard-line Islamist party, Saturday afternoon announced a boycott of the Karachi polls in protest against election irregularities.

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For example, the Islamic Circle of North America adheres to similar ideology as the Jamaat-i-Islami, which calls for Islamic revolution and creating an Islamist state in Pakistan.

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Jamaat-i-Islami (JI), the oldest religious party in Pakistan, boycotted the 2008 elections in protest at former military ruler Pervez Musharraf, but it has fielded some strong candidates in Punjab, Khyber Pakhtunkhwa and Sindh.

BBC: Q&A: Pakistan's parliamentary elections