accomplice|accomplices

警方逮捕了抢劫犯和他的同伙。

The police arrested the robber and his ___accomplice.

警方逮捕了这名诈骗犯和他的同伙。

The police arrested the fraudster and his ___accomplices.

警方逮捕了主犯和他的两名同伙。

The police arrested the main suspect and his two ___accomplices.