German police on Wednesday urged anyone who had a conflict with a recently deceased man to be wary, after a doctor was killed and a mother and daughter were injured by bombs apparently planted by him before he died.

Westpfalz police spokesperson Bernhard Christian Erfort told The Associated Press his office has received more than 60 calls to a hotline since it was established Monday, primarily from people worried about contact they'd had with gardener Bernhard Graumann, 59, who was found dead in his bed in the southwestern town of Mehlingen on Friday.

Graumann is believed to have planted a bomb outside the medical practice of a 64-year-old doctor in the nearby town of Enkenbach-Alsenborn that exploded Friday morning, killing the physician. Then on Sunday, a 37-year-old woman and her four-year-old daughter were injured by glass splinters when the woman put a log that had been rigged with explosives into her stove and it blew the door out.

Their injuries were not thought to be life-threatening, but the child is still in the hospital receiving treatment, Erfort said.

Graumann had been in conflict with both the doctor and with the family.

'Other preparations'

Another rigged fireplace log was found later Wednesday in a woodpile at the home of a woman in a different town who had clashed with Graumann, police said. Bomb disposal experts destroyed the device in place rather than try to remove it.

All of the towns are in an area northeast of Kaiserslautern, in southwestern Germany.

Erfort wouldn't comment on media reports that Graumann is believed to have killed himself, saying autopsy results were not expected until next week. He did say there was no sign of foul play.

In a search of Graumann's home, investigators found black powder and other items that were "in violation of weapons and explosives laws," police said.

"It cannot be ruled out that the deceased made other preparations that could endanger further people."

The investigation ongoing, and a news conference is being planned for later in the week.