<prompt> Translate the following text to EnglishMwanzoni waliwafikiria kuwa wafanyabiashara wa watumwa au askari waliokodishwa na miji mingine ili kuendesha biashara hiyo, lakini wafanyabiashara wote waliuawa, msafara mmoja baada ya mwingine.  <response>: At first they suspected rival slave traders or mercenaries hired by the other cities to corner the market on the trade, but all the traders were being killed one caravan at a time. 