What to do about people vandalizing our house?

A few weeks ago I woke up to go to work and when I opened my door, everything we have outside (a grill, chairs, table, plants, garbage cans etc) was piled up against our door so that I couldn't open it. We didnt do anything about it then. but I woke up this morning and someone had put a traffic cone on our porch. What do we do to let authorities know what is happening? and what do we do with the traffic cone? its about 3 or 4 ft tall and you cant just throw that away.