Pope declares he is 'more worried about mosquitoes' than terrorists as he arrives for his first ever visit to Africa amid fears of Islamist attack 

• Pontiff makes African trip which is fraught with security concerns 
• Thousands of troops in Kenyan capital Nairobi in preparation for his arrival
• Al Qaida's east African affiliate al-Shabab has committed Kenyan atrocities
• Pope says he comes 'with joy' ahead of giant open air mass for believers
• He will also visit Uganda and the Central African Republic during trip

The Pope has played down security fears as he arrived in Kenya on his first African visit.

Thousands of police and troops were deployed to the Kenyan capital with key roads closed amid a terror risk such as that posed by Al Qaida's east African affiliate al-Shabab, which has staged a string of attacks against Kenya because they have troops deployed in Somalia.

But Pope Francis said he had come with 'joy' and that he was 'more worried about the mosquitoes'.

A packed schedule will see the pontiff visit a Nairobi slum, a shrine to Christian martyrs in Uganda and both a mosque and a refugee camp in the Central African Republic.