Heat olive oil in large saute pan over mediom heat. Add onion, bell pepper and celery and cook until tender, about 5 minutes. Add garlic and cook a minute or two longer. Add shrimp, tomatoes and chilies, and diced Romas and stir well. Reduce heat to simmer; add tomato paste to broth, mix well and add to pan. Add seasonings and cook, stirring often, until shrimp are firm and sauce begins to thicken. Serve over rice.