Oil prices ticked up on Thursday following further Houthi attacks in Saudi Arabia, which led the United States to instruct certain diplomatic staff and dependents to depart its facilities in the kingdom. Brent crude futures gained $1.29, or 1.2 percent, to reach $110.11 a barrel as of 00:34 GMT, while US West Texas Intermediate (WTI) crude climbed 97 cents, or 1 percent, to trade at $98.12. The US State Department also intends to pull family members from several additional diplomatic outposts across the region, according to US officials speaking to the Reuters news agency.