The faq says:
If you do not award your bounty within 7 days (plus the grace period), the highest voted answer created after the bounty started with at least 2 upvotes will be awarded half the bounty amount. If there's no answer meeting that criteria, the bounty is not awarded to anyone.
What if more than one answer have the same number of upvotes? Who will get half the bounty? Will it be split again?