I finally found out the rest of the story. N was trying to stab R because he thought R was spreading a rumor that he was giving away cement from a project that my mother-in-law hired him to do.
That's it. Cement here is same as the states--a fairly cheap item. Life is back to normal I guess because N was back on the site yesterday working. R filed a police report so that way if she appears dead the police will have an easy time solving the crime.
All this over a rumor about cement!!!!!