[Nevadaref]

Originally Posted by bob jenkins

Yes, both spots have to be filled (assuming the team has at least two players). If you ask them to fill the spots and they don't, it's an immediate T.

Per this Case Book play:

*10.1.5 SITUATION C: The calling official has reported the foul and proceeds to his/her proper position for the first of two free throws awarded to A1. B1 and B2 are: (a) huddling in the lane; or (b) two B players are not occupying the first two marked spaces next to the end line as required. RULING: In (a), if the huddle delays the officials' administration, Team B is warned. The warning is recorded by the scorer and reported to the head coach. If Team B had been previously warned for delay, a technical foul shall be charged. In (b), Team B will be directed to occupy the required spaces. If there is delay, a technical foul shall be charged to Team B. (4-47)