I've seen these on other sites and the story has always been they were murderers/common criminals. Where'd you get the info they were formenting rebellion?
A site attached to a newspaper.
In communist countries, dissidents are often labeled "common criminals" or "mental patients" by the communist regime officials.
The Chi-coms have a credibility problem, especially when they use capital punishment on girls.
Perhaps the original site is
http://www.peacehall.com/news/gb/china/2004/12/200412130343.shtml
If I google for that url I get an offer of translating the Asian language to English.
Here is the translation,
"Makes the one shock executes by shooting the picture (2) (the warning! Terror)
"(Abundant news on December 13th, 2004)
"Abundant news editor's note: The reader through freely sent the manuscript and the abundant news uploads sends in the series executes by shooting the picture, the content makes the one shock. The abundant news at different times prints. Sends the manuscript not explains the time and the place. Thanks the reader provides the related picture.
"States: If the psychology is unable to withstand, please do not have to look below picture. To any consequence, the abundant news does not undertake the responsibility."
[the photos are here]
"(Tomorrow will publish another death penalty violates is executed is executed by shooting after the dead picture)"
"(Modified on 2004/12/13) (abundant news boxun.com)" [End translation]
You stated that you have seen the photos elsewhere. Do you remember where?
I have not read the entire thread. It appears that there is a dispute as to why the executions. It also appears that the site I quoted here did not state why the women were executed.