(REUTERS) — Gunmen linked to al Qaeda shot dead an American teacher in Yemen on Sunday, accusing him of Christian “proselytising”, and officials said government forces had killed a dozen militants in clashes and attacks on their strongholds.

The incidents underscore the challenges facing President Abd-Rabbu Mansour Hadi, who took office last month after a year of massive protests against his predecessor Ali Abdullah Saleh.

A police source in the city of Taiz said a gunman riding on a motorcycle driven by an accomplice shot the U.S. English language teacher, who was also deputy director of a language school, the Swedish Institute.

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