"Their" refers to whom?

Am wondering if someone who is proficient in English grammar can take a look at the following sentence and note there are 1) taskmasters, 2) officers, and 3) people. It is pretty clear that the taskmasters and the people are two different and opposing parties. The question has to do with "their officers." Which of these two groups do they belong to and that, at least to me, seems to beg the question of to whom the word "their" refers. What dose your grammar proficiency tell you?

And the taskmasters of the people went out, and their officers, and they spake to the people, saying, Thus saith Pharaoh, I will not give you straw.

Thanks in advance for sharing your understanding.