Residents of a street in the Melbourne suburb of Clayton are on edge after eight fires in the area in the past several months.
Firefighters put out two garage fires, one attached to a mosque, in Beddoe Avenue just after midnight.
Residents said it was the eighth time in three months that garages or sheds had been set on fire in their street.
Fulvia Vazzoler has lived in the street all her life and said everyone in the neighbourhood was worried.
"[This] is fire number eight in such a short time span and it's not a nice feeling," she said.
"It's normally such a quiet area, good street. It's always been a good area and with all these little goings on it just makes everybody feel uneasy.
"It's just beyond ridiculous. It's just a senseless thing to do."
Ms Vazzoler is worried the empty house across the street could be targeted.
"We have an abandoned house right across the road from our house and if it goes up then my neighbour's house will go up because there's a tree that goes from one roof to her roof and that house really scares me if that goes up," she said.
Police said a 42-year-old Wheelers Hill man was arrested today and is in custody.
They are investigating whether the two overnight fires were linked to a series of other blazes in the street.
