Formula One to review procedures after pit-lane 'shambles' in Azerbaijan
Stewards said in a statement they had summoned representatives of the FIA after the 'very dangerous' last lap incident.
"We noted that it was not unusual for the representatives to allow such persons into the pit lane just before the end of the race, in the usual course of preparation for parc ferme and the podium ceremony," they said.
"However, in this case, there was one driver that had to pit in the last lap and this created a very dangerous situation for those that were in the pit lane at the time.
"We considered that it was fortunate that there were no serious consequences on account of what happened today."
The stewards said the FIA must "take immediate steps" to reconsider procedures and protocols and ensure the situation did not happen again.
"The FIA representatives expressed their regret at what happened and assured us that they would do so in time for the next event," the statement added. Race five of the season is in Miami on May 7.
Frenchman Ocon, who started in the pit-lane, had left it until the very end to make his mandatory tyre change and spoke of his shock at the 'scary moment'.
"Fortunately, nothing happened, but we must make sure these scenarios don’t happen again," he said.
Sky Sports television commentators called the scenes, with a throng of people already in the pitlane as the car arrived, "an absolute shambles".
The photographers were gathered in front of the 'parc ferme' area in the pit lane where the top three finishers park up after the slowing down lap, while mechanics were celebrating on the pit wall.
Race director Niels Wittich warned teams at the previous race in Australia that they risked punishment if personnel climb pit wall fences to celebrate as their drivers took the chequered flag.
"The regulations I think are quite clear. The team manager had discussed it with the mechanics before the race," said Red Bull team boss Christian Horner, whose drivers Sergio Perez and Max Verstappen finished first and second respectively.
"I think if you look they've all got their feet in contact with the concrete of the pit wall.
"It's crazy when we're getting into regulating where the feet of the mechanics are," he said, adding that the situation with photographers did need reviewing, however.
"Esteban is within his rights to pit on the last lap and finish the race in the pitlane if he wanted to," said Horner.
"That's something that the FIA need to perhaps police a little better before the end of a race."
