Five men were arrested early Thursday morning after a home-invasion robbery in which the assailants knew the victims, police said.The Hamilton County Sheriff's Department said those arrested had stormed into a home in the 100 block of Sly Run, near State Road 38, at about 3 a.m.The home invaders, armed with pistols and long guns and wearing masks, accosted eight people inside the home, 6News' Julie Pursley reported.Police said three people were tied up in the walk-out basement of the home when officers arrived.The assailants apparently used chairs to strike the victims repeatedly. None of the victims suffered serious injury.Police said they think everyone involved, from the people in the home to those arrested, are between the ages of 18 to 20."They basically came to the residence (for) some sort of retaliation for something they feel these young adults had done or had taken from them," said Hamilton County sheriff's Deputy Vicky Dunbar. "We feel that it was targeted specifically at the young adults that were here."The victims' wallets and cell phones were taken, investigators said.Those arrested were: Kyle Zigler, 19, of Noblesville; Zachary Mason, 19, of Indianapolis; Benjamin Trebing, 20, of Indianapolis; Johnathan Brown, 19, Seminole, Fla.; and Alexander Neil, 18, of Indianapolis.Each of the men faces charges of robbery, criminal confinement, burglary, residential entry, theft and intimidation.