Weaker-than-expected growth in US jobs in recent months had already forced US central bankers to put off a rate hike at their meeting last week
Fed policymakers' deepening uncertainty about their own projections has resulted in the central bank sending mixed messages
Fed rate hike 'makes sense,' says US reserve bank president.
The central bank maintained its bias towards a rate hike.
Navinder Singh Sarao used a couple of fairly simple techniques.
Strong currency and sagging oil prices are spooking policymakers.