There is a slightly tense, nervous and uneasy atmosphere at the Bahrain International Circuit - a cocoon in the middle of the desert south of Manama. The security is significant. On the way to the track, there were around five different checkpoints along the motorway, car searches, armed military personnel and police.
However, the Force India team - some of whose members witnessed a firebomb explode off next to their car - has just announced it is considering pulling out of Friday second practice session. Their team members are not comfortable travelling back to Manama after dark. It is highly unusual for a team to jeopardise its chances in a race by forgoing an opportunity to practice.
Bernie Ecclestone, the Formula 1 supremo, arrived at the track earlier. He has been in talks with teams, trying to reassure them. However, after what happened to Force India those reassurances may seem a little hollow.
Publicly, the drivers say the right things and get on with their business. But it is clear when you speak to them privately that there is a sense of unease, and they feel slightly let down by the authorities.