An online public information campaign by Germany's health ministry which depicts Greece as a child under Turkey's care prompted reactions on social media on Monday.
A post on Twitter over the weekend about the campaign, which includes information in 16 different languages, includes a graphic depicting Turkey as a mother holding a child, Greece, by the hand.
Twitter launched on Wednesday an emoji for the European Parliament elections in May, seeking to provide a visual link to channel conversations around a vote set to affect the European Union in the coming years.
Together with Facebook and Google, Twitter has come under pressure to do more to combat disinformation about the elections.
Judicial actions have been taken against 2,793 social media users in 2018, Istanbul police have said in a statement.
Police are investigating an "incident" on a District Line underground train at Parsons Green, south-west London, reported BBC.
Officers and ambulance staff are on the scene following reports on social media of an "explosion" in a carriage.
A picture on social media showed a white bucket inside a supermarket bag, but does not appear to show extensive damage in the carriage.