"We are currently experiencing attacks on our infrastructure that is impacting online gameplay on BF4 PC. We are working on mitigating actions," a since removed statement on Battlelog's main page read, according to Kotaku.
A post by DICE’s Ali Hassoon on the Battlefield forums stated that the servers were targeted by an attack. "I’m sorry somebody is ruining your and my day. Rest assured we are doing our best to mitigate the situation though," he wrote.
Earlier this month, EA DICE issued a server-side update for Battlefield 4 which targeted persistent crashing issues on all platforms along with fixes for numerous issues for Windows PC version.
Polygon has contacted EA for comment.