Police announced last night that they have made an arrest in the Sept. 28 massacre of a toddler and three adults on Woolson Street in Mattapan.

Dwayne Moore, 22, has been charged with four counts of murder and one count of assault with intent to murder, along with other related charges.

Because the case is currently being heard by a Suffolk County Grand Jury, neither police nor District Attorney Daniel Conley’s office would comment.

Moore was in Boston police custody last night and is expected to be arraigned this morning in Dorchester District Court.

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