Crj-200 captain reported near midair collision in climb at FL265.

Attributes
ACN	1208281
Time
Date	201410
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Conflict NMAC

Narrative:

Climbing to fl 310 as cleared. Noticed TCAS target closing climbing through FL26.5. ATC told us to 'go back down and level off' at fl 260. Received an RA to 'descend; descend' and we acted accordingly. Descending aircraft came within 400 feet vertical clearance.

Original NASA ASRS Text

Title: CRJ-200 Captain reported NMAC in climb at FL265.

Narrative: Climbing to FL 310 as cleared. Noticed TCAS target closing climbing through FL26.5. ATC told us to 'go back down and level off' at FL 260. Received an RA to 'descend; descend' and we acted accordingly. Descending aircraft came within 400 feet vertical clearance.

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.