RENO, Nev. (AP) — The National Transportation Safety Board is releasing its recommendations on air race safety and providing an update on its investigation into the tragic crash at last fall's Reno Championship Air Races that killed 11 people and seriously injured more than 70 spectators.

NTSB Chairman Deborah Hersman will hold a news conference Tuesday in Reno, though the question of what caused Jimmy Leeward's souped-up P-51 Mustang to rocket straight up before pitching nose first onto the tarmac just feet from a VIP viewing area is still under investigation.

Officials say that technical finding could take several more months.

But the NTSB will recommend safety precautions as the Reno Air Racing Association moves ahead with plans to hold the event this fall at Reno Stead Airport.