B.U. officials reported no incidents yesterday as students began their spring break, one day after 1500 demonstrators assembled to voice objections to B.U.'s planned $400 tuition increase.

Nine people were hospitalized during the riotings, but all were released yesterday. Police arrested one person, who has been released on bail.

Spokesmen for students and administrators at B.U. agreed yesterday that members of local political organizations, and not B.U. students, incited Thursday's rioting.

Wesley R. Christenson, director of public relations at B.U., said yesterday. "Many protestors were over 30 years of age and not associated with B.U., but were probably members of such groups as the Revolutionary Communist Youth Brigade, who appear at demonstrations in the Boston area quite frequently."

The Student Coalition Against the Tuition Hike at B.U. staged the demonstration.

Five hundred protesters gathered outside the General Sherman Union while the board of trustees met inside. The protesters asked to meet with B.U. President John R. Silber, and when he did not appear, 100 demonstrators broke into the building.

The board of trustees had scheduled the meeting to discuss the tuition hike. Aaron R. Sherman, a member of the student union at B.U., said yesterday a new meeting will be scheduled immediately following spring break.