Police believe a brush fire that broke out yesterday along Kalanianaole Highway between Hawaii Kai and the Halona Blowhole was intentionally set. The highway was shut down at about 4 p.m. from Kealahou Street to Halona Blowhole and firefighters quickly extinguished it and the road was reopened at 4:30 p.m. Police have opened a second-degree arson case.  No arrests have been made.