Kejriwal's missive to Vice Chancellor Yogesh Tyagi came a day after he accused DU of "refusing" to show Modi's degree as he "never graduated" from it.
A delegation of AAP leaders had yesterday visited the university to seek a copy of the degree and later claimed they were "turned away".
In his letter, Kejriwal said the primary question was whether the Prime Minister had done his BA from DU or not.
"It is a matter of grave concern since the Gujarat University says that he (Modi) has done his Masters from there. If he has not pursued BA, then how could he secure admission in MA? This gives rise to suspicions that the MA degree is forged," Kejriwal wrote.
Referring to reports that the documents are not in safe custody, the AAP chief urged the VC to take steps to secure them and upload them on website.
"One English daily has reported that his degree is not secure and an accident may happen. This gives rise to another suspicion as to whether a ground for an accident is being prepared then?
