What's with the Pig Bones?

While the Jewish Haredi Organization and the Israel Archaeology Institute fight over the remains of ancient bones found at the dig site of a planned "Eden Hotel" in Jaffa, [according to The Jerusalem Post], I in the meantime find myself wondering about a detail of the article less meant as a focal point by its author -- Pig bones.  

Per Ben Hartman of the JP, "The burial of pig remains within human graves was a common practice among ancient pagans in what is today Israel."  

Indeed?  While I do recall learning, in a Global Studies class, the practices involving the sacrifice of one's horse or even [gasp!] one's wife/wives or concubines [so that they might join you on the darksome journey into the underworld], I fail to remember learning the details of placing the bones of pigs [or, per Wikipedia's details, the skulls of oxen] within a human grave.

I am shamed to admit that because I received my new cell phone via FedEx this morning, I find my time consumed fiddling with that rather than properly researching the details of this supposed ancient pagan burial practice among early Anglo-Saxons.  

And so I wonder, do you know...  What's with the Pig Bones?