This is what the Foreign & Commonwealth Office had to say today. Whilst not changing their overall Turkey advice they added:
"On 27 April 2016, there was a suspected suicide bomb attack at Bursa Ulu Mosque. The bomber was killed and 7 people slightly injured. It’s not yet known who carried out the attack. Attacks are likely to target the Turkish state, civilians and demonstrations. Nevertheless, it’s increasingly likely that some attacks will also target western interests and tourism, as they did in Istanbul on 12 January and 19 March 2016. To date most attacks in Turkey have taken place in the south and east of the country and in Ankara and Istanbul.
Turkish authorities have successfully disrupted attack planning in the recent past. The Turkish authorities have said that security has been tightened in response to recent attacks. Nevertheless, further attacks are likely, could be indiscriminate and may target or affect places visited by foreigners."