According to CNN, they were men:
http://www.cnn.com/2014/12/20/us/new-york-police-officers-shot/index.html?hpt=hp_t1
(Just getting in at 12:15am from a road trip, and getting caught-up on the news.)
The pictures of the officers have been posted, Liu and Ramos, both males, yes. Check the last few pages and you should find them.