* Islamists suspected in deadliest bombing of capital city
* First attack around Abuja in two years
* Bus station littered with blood and body parts (Updates with U.S. State Department comment in paragraphs 10-11)
By Isaac Abrak and Felix Onuah
ABUJA, April 14 (Reuters) - A morning rush hour bomb killed at least 71 people at a Nigerian bus station on the outskirts of the capital on ...