As her boyfriend was being arrested Wednesday on an assault charge after hitting her in the head with his motorcycle helmet, a Wantagh woman stepped in to defend him and also wound up arrested, Nassau County police said.

The two arrests came after Angelica Velotti, 24, and Christopher Wegner, 28, also of Wantagh, became involved in a verbal argument at about 6:30 p.m. that escalated into a physical altercation on Fir Street and Merrick Road, police said.

Wegner threw his helmet at Velotti, "striking her in the head causing an injury and dizziness," according to a news release.

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As Seventh Precinct officers attempted to arrest Wegner, he began "fighting and resisting," police said.

Velotti began "physically interfering" with officers and was told several times to stand back but ignored those orders, police said.

As Wegner was being arrested, a Metropolitan Transportation Authority officer assisting Nassau police sustained a broken finger on his left hand, police said.

Also, a Nassau County ambulance technician told police he saw Velotti remove a black-handled gravity knife from her boot and throw it to the ground. The technician recovered the knife and gave it to police, the release said.

Police on Thursday described the relationship between the two as boyfriend and girlfriend.

Wegner is charged with two counts of second-degree assault, resisting arrest and criminal possession of a weapon. The weapons charge is because he used his motorcycle helmet to cause injury, a police spokeswoman said Thursday.

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Velotti is charged with criminal possession of a weapon and obstructing governmental administration.

They are scheduled to be arraigned Thursday at First District in Hempstead.