TEHERAN, Iran, May 31— Terrorists exploded three bombs here today, one of them near the tomb of the Shah's father, Riza Shah, an hour before President Nixon was sched‐ uled to lay a wreath there. A second went off under a car carrying an American adviser to the Iranian Air Force.

The blast broke both legs of the adviser, Brig. Gen. Harold L. Price, injured his driver and killed an Iranian woman stand ing nearby.

The third bomb exploded in an alley next to the United States Information Service building, shattering windows. No injuries were reported. Ronald L. Ziegler, the White House press secretary, said this morning: “This is the activity of a very small group that has engaged in terrorist activities in the past. There is no indica tion whatever that any of the reported incidents were aimed at the well‐being of the Presi dent of the United States or any members of his party.”

President on Way

However, both American and Iranian security forces said they thought Mr. Nixon might have been in greater danger than he suspected. They specu lated that the bomb had been timed to explode when he ar rived but had gone off prema turely.