Manhunt for 'dangerous' murder suspect who dropped off baby after four relatives found dead

A car has been found during the search for a man suspected of killing the parents, grandmother and uncle of a baby girl found abandoned in a US state.

Austin Robert Drummond, 28, is suspected of having murdered four relatives in Tennessee - James M Wilson, 21, Adrianna Williams, 20, Cortney Rose, 38, and Braydon Williams, 15, who were identified on Wednesday. Mr Wilson and Adrianna Williams were the parents of the infant found alive in a car seat in a front yard on Tuesday afternoon.

Police say Drummond then dropped off the baby and made people aware of the child, in an act of "compassion". However, officers added Drummond remains on the run and should be considered "armed and dangerous".

Ms Rose was Adrianna and Braydon Williams' mother, according to District Attorney Danny Goodman. No details have been given on how they were murdered.

Drummond dropped off the seven-month-old infant and brought attention to people nearby to come get the child, Tennessee Bureau of Investigation Director David Rausch said during a news conference. The baby is safe and being cared for, according to Stephen Sutton, a spokesperson for the Lake and Dyer county sheriffs.

"While this was an extremely tragic and violent event... there was a sign of compassion, if you will," Mr Rausch said.

"That tells us that there's a possibility that Austin may have a sense that there is hope for him to be able to come in and have a conversation about what happened." Mr Rausch said he believes it was a targeted attack by Drummond, who had a relationship with the victims and their family. A relative of the victims posted on Facebook after the deaths, saying the suspect has "literally been nothing short of amazing to us and our kids.