Ugandans vote in tense election after violent campaign

What you need to know:

On Wednesday, Soldiers swarmed the streets of the capital and authorities blocked access to social media.
The military build-up has fanned fears of further election-related violence.
Museveni has ruled Uganda without pause since seizing control in 1986.
The run-up to polling day was marred by a sustained crackdown on Museveni's rivals.