A close aide to ousted Myanmar leader Aung San Suu Kyi was detained in a new wave of arrests following last week's military coup, a party official said on Thursday, as Washington moved a step closer to imposing sanctions on the junta.

The aide, Kyaw Tint Swe, had served as minister for the office of the state counselor under Suu Kyi, who has been detained since the Feb. 1 coup.

Kyi Toe, an information committee member of Suu Kyi's National League for Democracy (NLD), said Kyaw Tint Swe and four other people linked to the previous government had been taken from their homes overnight.