Parents speak of concern for missing coach THE parents of missing Melbourne tennis coach Paul Arber say he's never seemed a cause for concern, but that he had become "more insightful" in recent times. Paul Arber, 38, who was in Hamilton with a large group of children for a tennis tournament, hasn't been seen since the early hours of Sunday morning, when two people who had been walking over the Victoria Bridge saw him in the river. It was reported he talked to the pair and went back with them to the bridge but then changed his mind and walked back to the river. His parents Sam and Richelle Arber, who arrived in Hamilton on Monday, described their son as caring and sensitive. "Paul hadn't shown anything that gave us cause for concern before he left for New Zealand," Richelle Arber said. He had, however, become more insightful about people around him and he expressed a desire that we would become as passionate about the matters he had become passionate about, which were about the physical and spiritual wellbeing of others. Detective Inspector Karl Thornton said police were still treating the inquiry as a search for a vulnerable person who may need help. He said Arber had spoken of wanting to be closer to nature and of his warmth towards other people. Earlier in the evening he was endeavouring to introduce himself to other people and none of his behaviour has indicated any desire to harm himself or others. Thornton said a third person has been identified as possibly having had contact with Arber on Sunday morning and police hope to speak to that person later on Wednesday. From these people we have been able to get a clearer picture of just what Paul's unusual behaviour was and equally important, what it wasn't. Land and water based searches are continuing, as are searches of buildings, parks and reserves.