Konoha Ninja Village stated that while Asuna and the other Guardian Ninja were resting, their captain, Tobi, had led the Daimyo Mansion's Chakra Samurai in a surprise attack on their residence. They had barely managed to break out and contact the Konoha ninja camp near the Capital. A similar attack had also taken place at Grand Princess Qianji's residence. Since Qianji had already felt unsafe and discussed the matter with the Konoha ninja, after the attack on their own people, they had asked the ninja stationed at the camp to rescue her.
Konoha Ninja Village expressed outrage at Tobi's actions and demanded that the Daimyo Mansion punish him. He had not only attacked the Guardian Ninja but also attempted to murder a member of the Royal Family.
Kazemori Masaki did not accuse the Daimyo directly. Naming him as the chief culprit would immediately bring the conflict between the two sides to a head—not that this was out of the question, but accusing the Daimyo without evidence would make Konoha Ninja Village seem arrogant, insolent, and too proud of its accomplishments. Besides, the claim that the Daimyo had tried to murder his own younger sister did not seem particularly convincing.
Kazemori Masaki did not want any stains on his village's reputation. Even if Konoha Ninja Village would win, its publicity still needed to portray it as the weaker party, left with no other choice. That would benefit its image.
Konoha Ninja Village's account was easier for the Capital's officials to accept. Rather than believing the Daimyo had masterminded the affair, they preferred to believe Tobi had acted on his own. His reputation in the Capital was poor to begin with, and everyone knew he was hostile toward Konoha Ninja Village, so this was exactly the sort of thing he might do.