Turkish forces will continue their push towards Afrin in Syria despite "dirty, dark deals" between Kurdish forces and other factions on the ground, Turkish presidential spokesman Ibrahim Kalin said at a press conference on Wednesday.

His remarks followed multiple reports showing a pro-Syrian militia moving into the Afrin region. The forces are set to reinforce the Kurdish fighters against the Turkish army.

Talking to reporters in Ankara, Kalin warned that groups aiding the Kurdish YPG militia would be on the "same level as terror organizations."

"And for us, that would make them legitimate targets," Kalin said. "It doesn't matter who makes such an attempt, there will be serious consequences."

Read more: Turkey's offensive in Afrin - what you need to know

'Crime against humanity' in Ghouta

Kalin also denied that pro-Damascus forces crossed into the Afrin region. He confirmed that a convoy of 40 to 50 vehicles was headed toward the area, but said the Turkish army managed to repel them with artillery fire.

"Today, tomorrow could they attempt this again? It's possible. But the relevant measures have been taken," he added.

Seemingly contradicting Ankara's position, Syrian state news agency SANA on Wednesday reported that there were "new groups of popular forces arriving in Afrin" to support the local fighters against "the continued aggression of the Turkish regime."

Turkey's Kalin also commented on the Syrian regime's devastating attack on the rebel-held Eastern Ghouta, where shelling and airstrikes continue to claim civilian lives.

"We call on the Syrian regime to stop these attacks as soon as possible. This is a crime against the humanity," he said in Ankara.

Read more: Which rebel groups are fighting in Syria's Eastern Ghouta?

Moscow denies involvement in hospital attack

Some 300 civilians have been killed in east Ghouta since the regime started its attack late on Sunday, according to the UK-based Syrian Observatory for Human Rights. The watchdog also accused Russian air force of bombing a hospital in the densely-populated Damascus suburb.

In Moscow, however, Vladimir Putin's spokesman Dmitry Peskov denied that Russian planes were involved.

"These accusations are groundless and it is unclear what they are based on," Peskov said.

dj/msh (AFP, Reuters, dpa, Interfax)