Air carrier first officer reported a near midair collision after takeoff at bwi.

Attributes
ACN	1444540
Time
Date	201704
Local Time Of Day	1801-2400
Place
Locale Reference	BWI.Airport
State Reference	MD
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Route In Use	SID TERPZ6
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	Final Approach
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 227 Flight Crew Type 8000
Events
Anomaly	ATC Issue All Types Conflict NMAC

Narrative:

On climb out from takeoff on the terpz 6 RNAV departure; tower issued an immediate right turn away from traffic that was approaching to our front. Simultaneously we received a RA to climb. I executed a turn and climb; complying with the RA as the captain had visual with the small aircraft. The captain continued to monitor the other aircraft while keeping me informed as to its proximity. As the traffic continued to get closer I aggressively banked the aircraft in the attempt to avoid a midair collision. Between the aggressive bank and climb; we avoided impact. After the threat ended we proceeded to clean the aircraft up and climb out away from bwi tower admitted that a breakdown had occurred between the tower controller and departure.

Original NASA ASRS Text

Title: Air carrier First Officer reported a NMAC after takeoff at BWI.

Narrative: On climb out from takeoff on the TERPZ 6 RNAV Departure; Tower issued an immediate right turn away from traffic that was approaching to our front. Simultaneously we received a RA to climb. I executed a turn and climb; complying with the RA as the Captain had visual with the small aircraft. The Captain continued to monitor the other aircraft while keeping me informed as to its proximity. As the traffic continued to get closer I aggressively banked the aircraft in the attempt to avoid a midair collision. Between the aggressive bank and climb; we avoided impact. After the threat ended we proceeded to clean the aircraft up and climb out away from BWI Tower admitted that a breakdown had occurred between the Tower Controller and Departure.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.