A heavily-armed driver allegedly rammed his vehicle into a border patrol agent’s car in Midtown before being chased by the agent and police — who discovered a frightening arsenal that included armor-piercing bullets, sources said.

The Friday night mayhem unfolded around 9 p.m. when the 29-year-old slammed a Dodge Durango into the off-duty U.S. Customs and Border Protection worker’s unmarked vehicle at East 36th Street and Madison Avenue near the Empire State Building, police sources said.

The Dodge driver kept going, prompting the NYPD and the agent to give chase.

One of the bullet cartridges found in the Dodgte Durango had “Level III +” scrawled on it, which police believe means the bullets were body armor piercing. Obtained by NY Post

When they caught up with the motorist a few bloc

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