Alex Da Silva, a salsa dance instructor and choreographer for Fox's "So You Think You Can Dance," was arrested Saturday on suspicion of sexually assaulting four of his students, according to a statement from the Los Angeles Police Department. Da Silva, 41, is accused of assaulting the students in his two homes in the San Fernando Valley over the last six years, police said. He is being held in lieu of $3.8 million bail. Authorities said the four victims were all students of Da Silva at the time of the assaults.