CNN.com - Report: chimps used simple tools 5 million years ago - May 23, 2002

If by "tools" you mean the same sort of simple implements their descendants use today -- stones and twigs, with little effort used to modify them -- sure. And they probably weren't much different from what our ancestors were using at the time. Of course, our ancestors weren't much different from chimps' at the time. It wasn't until much later that humans became smart enough to really manufacture true tools.