Ref Mark Clattenburg has included the behavior of Tottenham fans in his report after their defeat at FA Cup opponents Arsenal.
The FA will examine video footage of the incident involving Walcott, who was pelted as he made an innocuous gesture indicating the score while being carried round the perimeter track.
According to those close to the incident, a minority of Tottenham supporters were chanting 'let him die' as Walcott received treatment.
Arsenal have CCTV footage of the section, which housed 3,000 of the 5,000 visitors, but admit it will be a painstaking process to identify the missile-throwers so Spurs can deal with the culprits.
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