New Delhi, Oct. 30 -- Tanzania 's presidential election teetered toward chaos on Wednesday as protests erupted, the military was deployed, internet service was cut and a curfew was announced in the commercial capital, Dar es Salaam.

Critics of President Samia Suluhu Hassan, who seeks a second term, and the Chama Cha Mapinduzi party that's ruled since independence in 1961 went into the streets to protest the harassment of opposition leaders, asserting that it had limited the election choices.

The U.S. Embassy issued a security alert citing "country-wide" protests in the east African nation.

Tanzania's inspector general of police, Camillus Wambura, announced the curfew in Dar es Salaam as of 6 p.m., after hundreds of protesters in the Ki...